6 Best Lawn Mowers for High Grass of 2025

This game-changing cordless mower redefines what electric can do, especially when tackling high grass with relentless power. Thanks to its brushless motor, it delivers gas-like torque without the noise or emissions, effortlessly slicing through thick overgrowth that would stall lesser mowers. The 21-inch steel deck and 7-position single-lever height adjustment mean you can set it high for initial passes on tall grass, then lower it gradually for a manicured finish—no bending, no hassle. For homeowners tired of gas fumes and pull-cord struggles, this is a breathtaking leap forward in ease and performance.

In real-world testing on neglected lawns with grass over 6 inches tall, the Greenworks 40V powered through with minimal slowdown, thanks to its efficient blade design and consistent motor output. The 5.0Ah battery delivered close to 45 minutes of runtime, enough to handle a 0.5-acre yard with moderate regrowth. Rear-wheel self-propulsion made uphill climbs and damp, heavy grass manageable, though very wet conditions slightly reduced traction. While it doesn’t have the brute force of a high-end gas model, its low maintenance, whisper-quiet operation, and instant start make it ideal for regular upkeep after the initial cut-down with a heavier machine.

Compared to gas-powered beasts like the YARDMAX or PowerSmart, this Greenworks model trades raw horsepower for eco-conscious efficiency and seamless usability. It’s not built for weekly mowing of 1+ acre overgrown fields, but for the eco-minded homeowner who values clean air, quiet mornings, and quick storage—especially with its vertical park design that saves 70% space. When stacked against the PowerSmart B&S model, it offers quieter operation and zero emissions, though slightly less sustained power in ultra-dense grass. Still, for best-in-class balance of power, runtime, and sustainability, this is the top pick for high grass on small to medium lots.

If you’re battling knee-high grass week after week, this muscular PowerSmart mower is engineered for the grind. Powered by a 140cc Briggs & Stratton engine, it delivers rock-solid reliability and relentless torque, chewing through dense, fibrous growth that would choke electric models. The 21-inch steel deck and rear-discharge option let you power-cut thick stands quickly, while the 1.4-bushel bag holds a surprising volume before needing emptying. For users with medium to large lawns overrun with tall grass, this is the workhorse you can depend on—rain or shine, dry or damp.

During testing on neglected suburban yards, the mower excelled on uneven terrain and tangled patches, thanks to its 10-inch rear wheels and rear-wheel drive that maintain traction where smaller wheels spin out. The single-lever 6-position height adjustment (1.5″ to 3.9″) allowed quick adaptation from aggressive trimming to fine-tuning. It handled mulching tall grass reasonably well, though clumping occurred when grass was wet—common across most mowers. The B&S engine fired up smoothly every time, even after weeks of storage, a major win for seasonal users.

Against the Greenworks cordless, this PowerSmart model wins in raw cutting stamina and all-weather resilience, making it the best for heavy-duty, frequent mowing. While it’s louder, heavier, and requires more maintenance, it doesn’t suffer from battery fade or charging delays. Compared to the AMERISUN gas mower, it offers superior engine reputation and smoother self-propel, though at a slightly higher cost. For those who prioritize durability and consistent performance over convenience, this is the gas-powered gold standard for high grass—delivering no-nonsense power with every pull.

Don’t let its compact 16-inch deck fool you—this ultra-lightweight Greenworks model is a nimble powerhouse for smaller lawns choked with high grass. Weighing significantly less than gas models, it’s 35% lighter, making it effortless to push and steer through thick patches without fatigue. The 40V brushless motor and 4.0Ah battery deliver up to 45 minutes of runtime, enough to tame a half-acre lawn, especially when cutting in dry conditions. Its smart cut adjustment and 2-in-1 mulching/rear bagging make it ideal for users who want clean results without the strain.

In real-world use, it handled moderately tall grass (up to 5 inches) with confidence, though it slowed slightly in the densest areas—nothing a second pass couldn’t fix. The single-lever 5-position height control lets you adapt quickly, and the whisper-quiet operation (<75dB) means early morning mowing won’t wake the neighborhood. While not suited for overgrown meadows, it shines on regular maintenance after initial clearing with a heavier mower. The lack of gas, oil, or emissions makes it a clean, low-hassle solution for eco-conscious homeowners.

Compared to the larger Greenworks 21″ self-propelled model, this one sacrifices cutting width and self-propulsion, making it less ideal for large or sloped yards. However, it’s more agile and easier to store, perfect for smaller properties or users with physical limitations. When weighed against the 18.5″ Easysurge model, it offers longer runtime and better warranty support, though lacks electric height adjustment. For lightweight performance with serious runtime, this is the best choice for manageable high grass on small to medium lawns.

This innovative cordless mower stands out with its industry-first electric height adjustment—a game-changer for user comfort. With a simple button press, you can shift between six cutting heights without bending, a huge plus for those with back issues mowing high grass across uneven lawns. Powered by Easysurge technology and a 4100 RPM brushless motor, it spins faster than many gas models, delivering clean, precise cuts even in thick stands. The 18.5-inch deck and self-propelled drive make it a strong contender for medium-sized yards needing serious cutting power.

In testing, the mower handled dry, tall grass (5–6 inches) with impressive efficiency, though it required a slower pace to avoid bogging down. The dual 4.0Ah batteries provided up to 30 minutes of runtime, sufficient for 1/6 acre per charge, but frequent recharging was needed for larger areas. The variable speed control (1.3–2.9 MPH) allowed customization for terrain, and the T-handle fold design simplified storage. However, in damp or overgrown conditions, the motor occasionally hesitated, indicating limits in sustained torque.

Against the Greenworks 21″ model, this one trades runtime and deck width for cutting-edge convenience features like electric height adjustment and rapid charging. While it’s not as powerful as gas mowers like the PowerSmart, it offers superior ergonomics and ease of use. For tech-savvy homeowners with medium lawns who value comfort and innovation, this mower delivers next-level convenience at the cost of raw endurance. It’s best suited for those who mow frequently and want to minimize physical strain.

The AMERISUN 21-inch gas mower is a budget-savvy powerhouse that punches above its weight in high grass conditions. Its 144cc OHV 4-stroke engine delivers smooth, consistent power, starting easily thanks to auto choke technology—a rare and welcome feature at this price. The 21-inch steel deck cuts wide swaths, reducing mowing time significantly, while the 3-in-1 functionality lets you bag, mulch, or side-discharge depending on grass volume. For users tackling overgrown yards without breaking the bank, this is a no-frills, high-value solution.

In real-world trials, it powered through thick, dry grass with confidence, though it required a steady pace to avoid clogging. The 10-inch rear wheels with dual ball bearings provided excellent roll-over on uneven ground, and the single-lever height adjustment made quick work of changing cut levels. The 1.4-bushel bag filled fast in high grass, demanding frequent stops, but that’s typical across this class. It’s noisy and requires gas maintenance, but starts reliably and runs cool, even during extended sessions.

Compared to the PowerSmart B&S model, it offers similar deck size and functionality but with a less proven engine brand. Against the YARDMAX, it lacks CVT speed control and heavy-duty build, but wins on affordability and ease of setup—ready to mow out of the box. For budget-conscious buyers with medium lawns and tall grass, this AMERISUN delivers solid performance without premium pricing. It’s the best bang-for-buck option when you need gas-powered reliability without overspending.

When the terrain turns sloped, bumpy, or wildly overgrown, the YARDMAX 22-inch mower dominates with unmatched traction and adaptive speed control. Its 201cc engine and 11-inch rear wheels deliver serious torque and stability, effortlessly powering through chest-high grass and uneven ground that would stall lesser mowers. The CVT 6-speed transmission is the star—simply select your pace, and the mower auto-adjusts to your walking speed, a revolutionary feature for effortless control on hills and thick patches.

In field testing, it crushed tall, tangled grass with ease, thanks to its heavy-duty 16-gauge steel deck and Maxflow airflow design that prevents clogging. The 7 height settings (1.38″–3.55″) and deck cleanout port made maintenance easy, while double ball bearing wheels ensured smooth rolling over roots and ruts. The rear bagger compatible design is a bonus for cleanup, though not included. On wet slopes, it maintained grip better than any other model tested, making it ideal for challenging landscapes.

Compared to the PowerSmart, it offers superior speed control and build quality, though at a higher cost. Against the AMERISUN, it’s in a different league of durability and performance. For large, uneven yards with high grass and slopes, this is the undisputed king. While heavier and pricier, its CVT system and rugged construction justify the investment for serious mowing demands. It’s the best for uneven terrain, offering professional-grade power in a consumer package.