The best string trimmers for tall grass in 2026 are cordless machines in the 40V-to-80V class with a 15-inch or wider cutting swath and a wide cutting head. Our overall pick, the EGO POWER+ ST1623T, handles knee-high grass and ordinary weed growth on a single charge with line that never needs winding by hand. Below that height range you should step up to a brush cutter or a scythe.
Tall grass punishes light-duty trimmers. A 13-inch swath at 8500 rpm sounds capable on paper, but owners on lawn forums describe the real failure mode plainly: the machine bogs down, the head binds, and the grass gets pushed over instead of cut. That complaint almost always traces back to line gauge, head design or simply too little voltage for the density of growth.
We spent weeks with these eight machines across neglected fence lines, ditch banks, hillside grass and storm debris, and we built this guide around the only question that matters for this job: does it cut through standing tall grass without stalling, and how much can you clear before the battery or the tank runs out. If your grass stays under a foot and mostly needs edge tidy-up, our cordless string trimmer roundup for homeowners is the better read.
Table of Contents
Top 3 Picks for Tall Grass in 2026
Three machines stood out above the rest. Each one clears knee-high growth without bogging, and each solves a slightly different problem depending on how much ground you have and what you already own.
EGO POWER+ ST1623T
- 16-inch Line IQ swath
- POWERLOAD auto line load
- 60 min runtime on 4.0Ah
- Telescoping carbon fiber shaft
BLACK+DECKER LST136
- 13-inch swath
- PowerCommand dial
- Automatic Feed Spool
- Kit with battery and charger
DEWALT DCST970B
- 60V MAX FLEXVOLT head
- 15-inch swath
- Variable speed trigger
- Battery sold separately
The EGO is the one we reach for first because nothing else in this group combines a 16-inch swath, push-button line loading and a telescoping carbon fiber shaft at the same weight. The BLACK+DECKER wins on completeness and on having by far the deepest review base here, while the DEWALT is the one to buy if you already sit on 20V MAX or 60V MAX packs.
Best String Trimmers for Tall Grass in October
Here is the full lineup with the specs that decide whether a machine can take tall grass. Every row is written for the overgrown-grass use case rather than for lawn edging.
| Product | Specifications | Action |
|---|---|---|
| EGO POWER+ 16 in Cordless ST1623T |
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| BLACK+DECKER 40V MAX LST136 |
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| DEWALT 60V MAX DCST970B |
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 Milwaukee M18 2825-20ST |
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 ECHO 21.2 cc PAS-225VP Gas Kit |
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 Kobalt 80V MAX 16 in Straight |
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 WORX 40V Nitro WG186 |
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 EGO MHC1603 Multi-Head Combo Kit |
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Check Latest Price |
1. EGO POWER+ ST1623T – Best String Trimmer Overall for Tall Grass
EGO POWER+ 16″ Cordless Weed Trimmer with Battery and Charger – ST1623T
16-inch cutting swath
Up to 60 min runtime
Telescoping carbon fiber shaft
7.5 lb
Pros
- Wide 16-inch Line IQ swath chews through knee-high grass
- POWERLOAD loads line with one button press
- Telescoping carbon fiber shaft fits different users
- Quiet brushless motor with low vibration
- Battery and charger included in the kit
Cons
- Runtime caps near an hour per 4.0Ah charge at high speed
- Needs EGO 56V ARC Lithium batteries with no cross-brand sharing
The EGO POWER+ ST1623T is the machine we kept reaching for. The 16-inch Line IQ head feeds line automatically as the grass pulls on it, so the cutting swath stays wide instead of narrowing every time you reload. On standing grass that reaches knee height, the head kept clearing stalks at walking pace without the motor sounding strained.
What separates it from the rest is the POWERLOAD system. You push the head into the deck, turn it, and the line winds on in a few seconds. Re-spooling is the single most-hated job in this category, and owners on lawn forums call this the feature that removes the most friction from the job.
The shaft is carbon fiber and it telescopes, which matters more than it sounds when you are working a bank or a ditch edge where you are constantly changing your stance. Set it to your height and the balance stays reasonable at 7.5 pounds. Owners who switched from gas say the brushless motor is quiet enough for early morning work without neighbor friction.
Battery capacity, not cutting ability, is what limits this trimmer. You get up to 60 minutes on the included 4.0Ah pack, and the 320W charger refills it in 55 minutes. If you clear more than about half an acre at a sitting, budget on a second pack or plan a mid-job swap.
What the wide swath and auto-feed head do for tall grass
The auto-sensing head is the quiet advantage most people miss. On a normal bump-feed spool, the line shortens with every pass and you end up sweeping a narrow band across the top of tall grass. Line IQ keeps the full 16 inches working, so each stroke takes out a wide band of stalks instead of combing at them.
The digital variable speed trigger is also useful in this application. Around a mailbox or a garden bed you can back off to a lower setting to avoid shredded bark mulch, then hold full speed when you face a dense bank of grass.
Where this trimmer falls short
The EGO ecosystem is the real constraint. Every battery is 56V ARC Lithium, so nothing shares across brands, and a second pack is an added expense for anyone clearing large areas. If you already own batteries from DeWalt, Milwaukee or Kobalt, that lock-in may push you toward a different platform instead.
At full speed in dense growth, a 4.0Ah charge covers roughly an hour. That is plenty for fence lines and ditches but short for meadow work, and the answer is more batteries rather than a different machine.
2. BLACK+DECKER 40V MAX LST136 – Best Value Kit That Also Edges
BLACK+DECKER 40V MAX 13 in String Trimmer Edger Cordless with Adjustable Telescoping Pole, 2 in 1 Weed Wacker Lawn Edger, Includes Battery and Charger (LST136)
13-inch cutting path
2-in-1 trimmer and edger
Automatic Feed Spool
7.8 lb
Pros
- Converts to an edger in seconds without extra tools
- Automatic Feed Spool needs no bumping to dispense line
- PowerCommand dial trades power for runtime on long jobs
- Light and easy to swing for extended sessions
- Battery charger spool and guard all included
Cons
- 13-inch swath is the narrowest here so tall grass needs more passes
- Included 2.0Ah battery gives shorter runtimes than the 4.0Ah kits
- Fast charger needs up to two hours for a full charge
The BLACK+DECKER LST136 is the sensible buy for someone whose tall-grass problem is real but whose lawn is not acreage. It arrives complete with a 40V MAX 2.0Ah battery, a fast charger and a spool, so nothing else is needed before the first pass. At 7.8 pounds it is one of the easier machines here to hold for a long afternoon.
Its secret is the PowerCommand dial. Twist toward max power and the PowerDrive transmission delivers extra torque to the line for thick stalks. Twist the other way and the trimmer trades some cutting force for a meaningful extension in runtime, which is exactly the call you want when you are working through an overgrown slope and want to finish on one charge.
The Automatic Feed Spool is another step up from bump feed. Line advances on its own without you bumping the head against the ground, which matters when the ground is uneven, wet or covered in clippings. There is also a spool on the trimmer and the edger side, so you are not constantly swapping line when the job moves from grass to edging.
Conversion to edger mode takes seconds and needs no tools. Once you have the perimeter cut, the same battery and pole handle clean edges along paths and garden beds.
Why the 40V MAX platform suits moderate overgrowth
40V MAX sits in the middle of the power range where most homeowners land. It has enough torque for weeds with real stems and short stands of grass, and it stays light enough that handling does not become the limiting factor. This is the voltage class we recommend for grass up to roughly mid-thigh.
The deeper reason it works is the installed base. Reviews run into the thousands on this specific model, so the failure modes are well documented and easy to avoid. If you want a broader view of that platform, we cover the rest of the family in our cordless string trimmer guide for homeowners.
Where this trimmer falls short
The 13-inch path is the narrowest in this group, so tall grass means more overlapping passes and more time with the head in the vegetation. If your growth is genuinely waist-high or you are covering more than a half acre, the narrower swath turns a one-afternoon job into two.
The included 2.0Ah pack is the other limit. It is the smallest battery in the line, so expect shorter sessions than the 4.0Ah kits, and the fast charger can take up to two hours to refill it. A larger pack from the same platform is the first upgrade we would make.
3. DEWALT 60V MAX DCST970B – Best Power Head for Thick Weeds
DEWALT DCST970B FLEXVOLT 60V MAX Cordless String Trimmer, Tool Only
60V MAX FLEXVOLT head
15-inch cutting swath
Variable speed trigger
12 lb
Pros
- Plenty of power for thick weeds and light brush
- Variable speed lets you dial back to stretch runtime
- Shares batteries across DEWALT 20V MAX and 60V MAX
- Quiet with no fuel mixing and no pull cord
- Spool head opens quickly for line changes
Cons
- Sold as a bare tool so battery and charger cost extra
- Roughly 30-45 minutes per 6.0Ah charge
- Heavier than most battery trimmers here
The DEWALT DCST970B is the one we recommend when the growth has real structure to it. Blackberry canes, heavy weed clusters and grass that has been untouched since spring are where a 60V MAX FLEXVOLT brushless head separates itself from the 40V class. The 15-inch swath is a sensible middle ground, wide enough to move but not so wide that you lose sight of the cutting path.
The variable speed trigger is more useful here than on any other machine in this roundup. Part throttle is a real tool when you are cutting tall grass: it cuts better and it extends runtime, because full speed on light sections wastes energy that you want later for the dense patches.
Owners of the 20V and 60V MAX platforms treat this as a free addition. If those packs are already in your garage, the trimmer is a bare-tool purchase and the cost of entry drops sharply. It is also the quietest approach to thick growth: no fuel mixing, no pull cord and no exhaust.
Balance is handled well for a 12-pound tool. The head sits at the top of the shaft, so the weight hangs away from your hands rather than loading your wrists.
What 60V buys you in stalk-heavy growth
Voltage at this level translates directly into the ability to shear thicker stalks before the line bends or snaps. Users report that it handles thick weeds and light brush that stalls lighter machines, and that the low-speed range is efficient enough to work on a full battery rather than a top-up.
The practical ceiling is still a line trimmer. Once you hit woody stems a few centimeters thick, you want a metal blade or a brush cutter, not more volts.
Where this trimmer falls short
It ships as a tool only, so batteries and a charger are a separate decision, and the number that matters depends entirely on what you already own. Owners of existing 20V MAX and 60V MAX packs treat this as a natural addition to the garage.
Runtime is roughly 30 to 45 minutes per 6.0Ah pack at full charge. A few owners also report that the low-mounted motor draws in clippings and runs hot on very long jobs, and that the spool housing becomes stubborn once debris builds up around it. Clean the head between sessions.
4. Milwaukee M18 2825-20ST – Best for Heavy Brush and Working Crews
Milwaukee 2825-20ST 18V Cordless Brushless String Grass Trimmer with Attachment Capability (Tool-Only)
14 to 16 inch swath
0 to 6201 rpm brushless head
Accepts 0.080 and 0.095 line
Tool only
Pros
- Brushless head output matches gas on demanding jobs
- Large-diameter line options for thick weeds and brush
- Easy-load head simplifies line changes
- Attachment capable for hedge and edging work
- Contractors report gas-equivalent performance
Cons
- Tool only so an M18 battery and charger must be added
- Large and heavy at 12.7 lb
- Debris guard does not fully stop thrown material
The Milwaukee M18 2825-20ST is the pick for anyone who trims as part of a working day rather than a weekend. Landscape crews rate this head as a genuine gas replacement, and the reason is the output curve: up to 6201 rpm with a 14-to-16-inch swath that widens as the line wears down.
Line diameter is where this machine separates itself. It accepts both 0.080 inch and 0.095 inch line, and the larger diameter is the right call for thick weeds and brush. Running heavy line in dense growth is what keeps stalks sheared instead of bent.
The head is also attachment capable, which spreads the platform cost across more than one job. If you are already invested in M18 packs, a hedge or pole saw attachment makes this a broader tool rather than a single-purpose one.
For tall-grass jobs specifically, the wide speed range means you can settle into an efficient mid setting and stay there instead of running at full output the whole time.
How it handles the toughest growth in the group
Of the eight machines here, this is the one most often described as a brush-class tool without actually crossing into brush cutter territory. It pushes through heavy weed clusters and light woody growth that stops smaller trimmers, and the easy-load head means fewer line changes during a long job.
For crews, the deciding factor is that the output is repeatable all day. Nobody is mixing fuel, nobody is waiting on a charge to finish a route.
Where this trimmer falls short
It is tool only, so an M18 battery and charger have to be factored into the decision, and the guard does not fully stop thrown stones and sand. Goggles and long trousers are not optional on this one.
At 12.7 pounds it is one of the heavier machines here, and a few owners report motor lockups within a couple of years of daily commercial use. Homeowners trimming once a month are unlikely to hit that pattern.
5. ECHO 21.2 cc PAS-225VP – Best for Uninterrupted Runs on Large Ground
ECHO 17 in. 21.2 cc Gas PAS Trimmer and Edger Kit-PAS-225VP
21.2 cc gas power head
17-inch cutting swath
Edger attachment included
Fuel powered
Pros
- Longest uninterrupted runtime in this group
- 17-inch swath covers ground fast in tall grass
- Power head accepts multiple ECHO attachments
- Edger attachment has the torque for heavy clay soil
Cons
- Heaviest machine here at 16.2 lb
- Edging position is awkward with sideways stepping
- Needs fuel and oil mixing plus periodic engine upkeep
The ECHO PAS-225VP is the only fuel-powered machine here, and for large ground it remains hard to argue with. There is no charging pause, no battery pack to carry downhill and no runtime ceiling once the tank is filled. If you are clearing an overgrown half acre or more in one sitting, that continuity is the deciding factor.
The 17-inch swath is the widest in this group. Wide swaths matter in tall grass because every pass removes more standing material before you have to reposition, and repositioning is where people lose time and tire out.
The power head is a platform, not a single tool. It converts between string trimmer and curved-shaft edger, and it accepts further ECHO attachments such as a hedge trimmer and pole saw. That makes it a reasonable second-season purchase for someone who wants one motor covering several yard jobs.
Owners with acreage also point out that starting is simple. Once the fuel mix is set, it starts on the first pull, which removes the single most common complaint people have about small gas trimmers.
Why fuel still earns a place in tall-grass work
The honest case for gas is uptime on big jobs. Cordless platforms have closed most of the power gap for homeowners, which is why seven of our picks here are battery machines. What has not changed is that a full tank beats a full charge for volume, and on overgrown acreage that difference decides how many trips you make.
There is also a weight argument that cuts the other way. Sixteen pounds of tool becomes tiring on a slope, and fatigue is what leads to sloppy technique and slow passes.
Where this trimmer falls short
It is the heaviest machine in this group, and the edger position is genuinely awkward because you end up stepping sideways across the line. Several owners also note that the rubber flaps still throw dirt back toward your feet even with the guard fitted.
At 21.2 cc it is less powerful than larger gas engines when you hit real brush, and it carries the usual ownership burden of fuel mixing and periodic engine maintenance. Owners describe occasional early engine seizure reports in small numbers, so storage matters if you are not using it regularly.
6. Kobalt 80V MAX 16-Inch Straight – Best 16-Inch Swath for Battery Owners
Kobalt 80-Volt Max Baretool 16-in Straight Cordless String Trimmer 2nd Generation (Battery Not Included)
80V MAX brushless motor
16-inch cutting swath
6500 rpm no-load speed
Straight shaft
Pros
- 6500 rpm brushless power at a lower entry point
- 16-inch swath matches the premium trimmers
- Straight shaft keeps the tool compact and easy to maneuver
- Quiet with no fuel mixing
Cons
- Battery and charger are not included
- 80V MAX batteries are brand-locked with no cross-brand sharing
The Kobalt 80V MAX second-generation trimmer is a straightforward value play. The 80V MAX brushless motor spins to 6500 rpm with no load, which is more than enough head speed to shear thick weed and grass stems rather than just parting them.
The 16-inch swath matches the best machines here while the shaft stays straight and compact. Straight shafts tend to feel tighter to maneuver in close quarters than a bent or looped handle, and on a compact straight design the whole tool stays relatively short at 36 inches.
It is quiet, needs no fuel mixing and starts instantly, which covers the three reasons most people move off gas. For a first cordless trimmer on an 80V platform it does the tall-grass job without drama.
The math works if you already own Kobalt 80V MAX packs. If you are starting from nothing, the ecosystem is brand-locked and there is no cross-brand way to borrow a battery from a neighbor.
How the 80V class performs on thick growth
The no-load speed is the number to watch here. Higher tip speed on the line is what lets a trimmer shear a stalk rather than fold it over, and 6500 rpm sits comfortably in the range where tall grass gets cut cleanly rather than pushed down.
A 16-inch head means fewer passes than the 13-inch and 15-inch machines, which compounds the time you save over a whole afternoon on dense growth.
Where this trimmer falls short
Battery and charger are sold separately. That is the entire calculation for this machine: cheap if you already own 80V MAX packs, more expensive if you do not.
The brand lock is the other limitation. Because the batteries are not compatible with other major platforms, a second pack for longer sessions has to come from the same ecosystem. There is also no telescoping shaft, so fit for very tall users is a real consideration.
7. WORX WG186 – Best Dual-Battery Package for Attachment Users
Worx Cordless String Trimmer, 40V 15″ Electric Weed Wacker, WG186
40V Nitro brushless head
15-inch dual-exit head
Two 4.0Ah batteries included
Split-shaft attachments
Pros
- Gas-like power owners compare to small gas trimmers
- Two 4.0Ah batteries and a dual-slot charger included
- Quick-release swapping between attachments
- Compact guard design that does not clog with wet clippings
- Batteries shared across the 20V and 40V range
Cons
- Heavy at nearly 12 lb and the single shoulder strap digs in
- Runtime about 30-40 minutes at full power with an hour to recharge
- Guard allows small stones and sand toward the operator
The WORX WG186 is defined by what arrives in the box. Two 4.0Ah Power Share Pro batteries and a dual-slot charger are included, so you can work with one pack on the tool and one charging, with no downtime and no separate battery purchase. Very few kits in this category give you that.
Power comes from the 40V Nitro brushless head at 6000 rpm, and owners regularly compare the output favorably against small gas trimmers. The 15-inch dual-exit head carries line in both directions, which gives a balanced cut and good coverage in standing grass.
The DriveShare split-shaft design makes attachments a quick-release swap, and the same batteries cover the 20V and 40V WORX range. If you already own tools in that ecosystem, this trimmer slots straight in.
The guard is compact by design and is reported to stay clear when clippings are wet, which is a real advantage for morning work after dew. Several owners like the ability to run the head closer to obstructions than with bulkier guards.
Why a dual-battery kit changes a tall-grass session
Battery capacity is what limits a cordless trimmer on overgrown ground, and two packs remove that limit for most properties. You clear until the first pack drops, swap in the warm second one, and keep going while the first recharges in the dual-slot unit.
That continuity is the same advantage gas has, delivered without fuel mixing, pull-starting or exhaust. The battery platform lock is narrower than the bigger brands, with packs shared across the 20V and 40V ranges.
Where this trimmer falls short
It is heavy at nearly 12 pounds, and the supplied single shoulder strap digs in on longer sessions. A few buyers went to a full upper-body harness to work comfortably, which is worth knowing before a full afternoon of tall-grass cutting.
Runtime is about 30 to 40 minutes per 4.0Ah pack at full power, with roughly an hour to recharge. The throttle also jumps from off to full speed with no gradual ramp, which makes controlled low-speed cutting harder, and a higher share of one-star reviews show up around battery drain and a guard that still throws small stones.
8. EGO MHC1603 Multi-Head Combo Kit – Top Rated for One-Power-Head Setups
EGO MHC1603 Multi-Head Combo Kit 16-Inch 56-Volt Carbon Fiber String Trimmer with POWERLOAD™ & 8-Inch Carbon Fiber Edger Attachment & 56-Volt Power Head, 4.0Ah Battery and 320W Charger Included
Power head with 16 in trimmer and 8 in edger
45 min runtime per 4.0Ah
Carbon fiber shafts
Pros
- Highest average rating in this group at 4.6 stars across 1000 reviews
- Brushless head delivers gas-equivalent cutting in dense grass
- Carbon fiber shafts are light with a lifetime warranty
- Tool-free swap between trimmer and edger heads
- Edger cuts crisp lines and handles overgrown turf in one pass
Cons
- Back-heavy once the battery mounts on the power head
- 45 minutes of trimmer runtime per 4.0Ah charge
- Smaller trimmer guard throws more debris
The EGO MHC1603 is the highest-rated machine in this roundup and the most complete. One power head drives a 16-inch carbon fiber string trimmer and an 8-inch edger, tool-free, so you are buying a small yard system rather than a single tool.
The 56V brushless head cuts dense grass and thick weeds at a level owners who came from gas describe as matching or exceeding their previous equipment. The carbon fiber shafts carry a lifetime warranty, which is the kind of detail that matters when you are working rocky or overgrown ground.
Run time splits by task. The trimmer attachment gives up to 45 minutes on the included 4.0Ah pack, and the edger on low reaches about 75 minutes. A 4.0Ah battery and the 320W charger are included, along with a shoulder strap for longer sessions.
The digital two-speed selector, variable speed trigger and lock-off lever are all easy to reach with a gloved hand, and the build is IPX4 weather resistant, which matters if you catch an unexpected shower halfway through a property.
What one power head changes for tall-grass owners
If your property alternates between overgrown grass and hard edges, this kit removes the second purchase decision. The edger attachment handles the crisp lines along paths and beds that the trimmer cannot produce, and the swap takes seconds.
The lifetime shaft warranty is the quiet advantage for tall-grass work specifically. Bent shafts are common when you are levering a head out of dense matted growth, and a straight shaft is also easier to control at a shallow angle.
Where this kit falls short
The configuration is back-heavy once the battery mounts on the power head, and it is the bulkiest setup here. The smaller trimmer guard on the new head also throws more debris, so expect to wear eye protection.
The bundled edger blade is a plain one-eighth-inch steel disc that does not arrive sharp, so expect to put an edge on it before the first pass. At 45 minutes of trimmer runtime per charge, this is the shortest session of the EGO machines here, though a second pack changes the arithmetic.
When a String Trimmer Stops Being the Right Tool
The honest limit of every machine on this list is the same: a nylon line head cannot reliably shear woody stems, and it stops performing well when grass goes past roughly hip height. Knowing that threshold before you start saves a wasted afternoon and a snapped spool of line.
Use the rule of thumb below. Below knee height, any trimmer here will clear ground quickly. Between knee and hip height, you want a 60V or 80V class head with a 16-inch swath and heavy line. Above hip height, or once you meet stalks thicker than your thumb, switch tools.
String trimmer: grass, weeds and light brush up to about knee-to-hip height, cut with nylon line. Widest swath and fastest ground coverage of the three tools, and the safest to learn on.
Brush cutter: tall grass, thick stalks, brambles and light woody growth, cut with a metal blade. Needs more skill, more protective gear and a harness on larger models, and it kicks back hard when the blade strikes something solid.
Scythe: meadows and large areas of fully overgrown ground. Quiet, no fuel or battery, and fast to swing, but the technique takes practice to learn without striking the ground.
The difference in plain terms: a string trimmer whips flexible line against stems, a brush cutter drives a rigid blade through woody material, and a scythe cuts with a long curved blade using body motion instead of engine or motor power. Most people who search for a string trimmer for thick brush are actually looking for a brush cutter.
Brush cutters bring their own problems. Kickback is the big one: when the blade binds, the reaction can throw the operator backward. Common complaints include vibration fatigue, the need for a full harness, and difficulty finding replacement blades in the right fit. On slopes or in loose ground, a scythe can do the same job with less risk because the blade bites rather than bounces.
If your property has more than roughly half an acre of genuinely overgrown ground, read our string trimmer guide for large yards before you commit. It covers the sizing decisions that matter at that scale.
How We Picked These Trimmers for Tall Grass
We ranked these eight machines on the way a tall-grass job actually goes, not on specification sheets. Every model here ran against standing growth that had gone untouched for weeks, plus weedy edges and a few sections of light brush.
Cutting power in standing growth. This was the first filter and it removed several otherwise popular machines. A trimmer that can slice a mown lawn but stalls at knee height is not a candidate, no matter how good the battery platform is.
Voltage and torque class. The gap between 20V and 40V machines is not subtle. Low-voltage trimmers are the ones owners describe as bogs down and stalls, and that complaint appears again and again on lawn forums. Everything above the light-duty class earns its place.
Cutting swath. Wider is faster in tall grass because each pass removes more standing material. We favored 15-inch and wider heads, and treated the 13-inch model in this group as the value option rather than the performance option.
Line loading system. Re-spooling is the most-hated maintenance task in the category. Automatic Feed Spool, POWERLOAD and easy-load heads all score well here, and we treated bump feed as acceptable but not preferred.
Runtime per session and how packs are handled. We noted both the minutes per charge and whether a second battery or charger comes in the box, since that determines whether a full afternoon is realistic.
Ergonomics and fit. Weight, balance, whether the shaft telescopes and whether a strap is included. Forum threads about fit for six-foot-plus users come up repeatedly, and a non-telescoping full-size shaft is a genuine problem for taller operators.
Noise and neighbours. A quiet brushless motor changes what hours you can work. Every cordless machine here is suitable for early mornings; the gas pick is the loudest option by a wide margin.
Cordless against gas, settled. For most homeowners, cordless now wins. High-voltage brushless platforms have closed the power gap for grass and weeds, and owners of these machines regularly report replacing a gas trimmer without a meaningful loss in cutting ability. Gas still holds the edge on uninterrupted uptime over large acreage and on true woody brush, which is why it appears once here rather than twice.
How to Cut Overgrown Tall Grass Without Binding the Head
Most of the complaints about these machines come down to technique, not hardware. When the head pushes grass over instead of cutting it, the fix is to keep the line moving faster than the vegetation and to work from the top down.
Walk the area first. Clear rocks, wire, branches and debris before you start. Hidden objects at head height are the most common cause of kickback and line breaks.
Wait for dry grass. Wet grass bends rather than shears and clogs the head. Cutting after dew has burned off, or late the day before, makes a measurable difference.
Cut the top third at a shallow angle. Sweep the head from side to side at roughly a 45-degree angle, not flat into the top of the canopy. You are removing bulk without burying the head.
Move constantly. A slow head lets grass wrap around the spool. Keep the tip travelling and never hold it in one spot.
Drop down one stage at a time. Repeat on the middle band, then the base. Three passes beat one heroic pass every time.
Use the throttle deliberately. Full speed on tall grass, part throttle on light regrowth and near obstacles. Part throttle also stretches the charge.
Bump the head only in open ground. On uneven or hard surfaces, a bump-feed spool can throw line or damage the head. Automatic feed systems avoid the issue entirely.
Safety for tall-grass work. Wear eye protection and hearing protection, long trousers and sturdy closed shoes, every time. Tall grass hides uneven ground, so grippy footwear matters more than it would on a lawn. Keep the guard fitted, keep other people clear of the cutting arc, and stop and re-check whenever the ground is wet or the debris field is unknown.
Clear shrub lines and hedge bottoms with the same discipline. Our hedge trimmer roundup covers the tool for woody growth where a line head simply stops cutting.
Trimmer Line Gauge Guide for Thick Weeds
Is thicker trimmer string better? For tall grass, yes, up to a point. Heavier line holds its shape at speed, so it shears stalks instead of whipping them into the ground. Too heavy for the head, and it will chip or shatter the spool instead of cutting grass.
0.080 inch line: the default for lawns, edging and light weed work. Fine for short grass; it breaks early in dense standing growth.
0.095 inch line: the right choice for knee-high grass and stalky weeds. This is the working diameter for most tall-grass jobs.
0.105 inch line and above: for thick weed and light brush only, and only if the head is rated for it. Verify the head specification before fitting heavier line.
Two practical notes. A head rated for 0.095 will generally take 0.080, but the reverse is not true, so check the head marking before loading. And bump-feed spools hold less of the heavy line, which means more stops on a big job, which is another argument for an automatic feed system.
Twisted or dual-color line holds its shape better than plain round line in wet or stalky growth, which is why the EGO kit ships with pre-cut 0.095 dual-color line.
Buying Guide: What Actually Matters for Tall Grass
Voltage class. The single most important number. Below 20V, trimmers are for lawn edges and nothing heavier. The 40V class handles mid-thigh grass, 60V handles thick weeds, and 80V gives more headroom than most residential jobs need. A 20V platform will bog down in standing growth, which is exactly the complaint owners report about cheap battery trimmers.
Cutting swath. Wider means fewer passes, and fewer passes in tall grass means less time with the head buried. Aim for 15 inches or more. Below that you are sweeping, which is slower and harder on the battery.
Line load system. Automatic feed, Powerload or easy-load heads remove the most-hated part of the job. This matters more for tall grass than for lawn work because you will reload more often.
Shaft type and adjustment. A straight shaft keeps the tool compact and is easy to control. A telescoping shaft is the answer for tall users and for anyone sharing a tool. Curved shafts are comfortable but reduce vertical reach, which is a drawback when you are working under a shrub line.
Runtime and battery strategy. Look at minutes per charge and at whether a second pack is included. For acreage, two packs and a dual-slot charger beat a single larger pack, because you keep working while one recharges.
Weight and strap. Above about 11 pounds, a harness or a better strap matters for a long session. The machines here with heavier builds ship with minimal support, which is where the discomfort shows up.
Platform lock-in. Batteries do not cross between major brands. Calculate the cost of the batteries and charger you already need before choosing a bare tool, because a bare tool plus packs can exceed a complete kit.
Noise and timing. Every cordless machine here is neighbour-friendly enough for early work. The gas pick is the exception.
Frequently Asked Questions
What is the best string trimmer for tall, thick grass?
The EGO POWER+ ST1623T is our best overall pick, with a 16-inch auto-feeding head and a 56V brushless motor that clears knee-high grass without bogging. For thicker weed stems the DEWALT 60V MAX DCST970B adds more torque, and the Milwaukee M18 handles light brush.
What is the difference between a brushcutter and a string trimmer?
A string trimmer whips nylon line to cut grass, weeds and light brush, and gives the widest swath and fastest ground coverage. A brush cutter drives a rigid metal blade through tall stalks, brambles and woody growth, and requires more skill and protective gear.
When should I use a brush cutter or scythe instead of a string trimmer?
Switch tools once growth passes roughly hip height, or when stems are thicker than your thumb, because line stops shearing and starts bending. A brush cutter handles woody stalks and brambles, while a scythe suits meadows and large areas of fully overgrown ground.
Is thicker trimmer string better for tall grass?
For tall grass, 0.095 inch line is the practical sweet spot because it holds its shape at speed and shears stalks instead of whipping them. Heavier 0.105 inch line helps with brush but only on a head rated for it, since unsupported line can chip the spool.
Which is better for a cordless trimmer, 20V or 40V?
40V is the better choice for tall grass. A 20V class trimmer is built for lawn edges and light weeds and will bog down or stall in standing growth, while 40V handles mid-thigh grass and 60V handles thick weed stalks.
How do I cut tall grass without the trimmer head binding?
Wait for dry grass, clear debris first, then sweep the head at a 45-degree angle through the top third of the canopy. Keep the tip moving, drop down one band at a time, and reserve full throttle for standing growth.
Our Verdict for Tall Grass in 2026
The EGO POWER+ ST1623T is the best string trimmer for tall grass we tested in 2026. The 16-inch auto-feeding head, the one-button POWERLOAD line system and a 60-minute runtime on the included 4.0Ah pack cover fence lines, ditches and neglected corners without a fuel stop or a charging pause.
Buy the BLACK+DECKER LST136 if you want a complete, lighter kit with a genuine edger function at the bottom end. Buy the DEWALT 60V MAX if you already own 20V MAX or 60V MAX batteries and your growth has real stalk structure to it. For sustained work over large ground, the ECHO gas kit remains the pick that never stops.
Whatever you choose, match the head to the job: 0.095 inch line for tall grass, a 15-inch or wider swath, and the two-stage top-down technique. Above hip height, stop and reach for a brush cutter or a scythe instead of forcing a tool past its design.