Pushing a heavy mower across uneven or sloped yards quickly turns weekend yard work into an exhausting chore, and under-powered machines bog down in thick spring growth, leaving uneven stripes and clumps. Homeowners need reliable, easy-to-steer cutting power without breaking the bank or wasting time on extra passes.
The best 21-inch self-propelled gas lawn mowers solve these headaches with powerful 201-cc engines, rear-wheel drive traction, and cruise-style variable speed control—so you simply walk behind while the machine does the heavy lifting. After evaluating over 60 models, we prioritized performance features like high-torque engines and durable cutting decks, along with user-focused designs found in top picks such as the Honda self-propelled mowers and reliable Toro lawn mowers.
Our research included hands-on testing, expert analysis, and verified owner reviews to identify the six standout models that deliver the cleanest cut with minimal effort. Whether you’re maintaining a small, flat lawn or tackling thick grass on inclines, check out our full rankings including the best budget lawn mowers and most durable mower decks to find your ideal match.
Our Top Picks
Image | Product | Details | Price |
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Best Overall
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YARDMAX 22 in. 201cc PACE Mower
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CVT (Continuously variable transmission) 6-speed 1.38 in. to 3.55 in. |
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Best Mid-Range
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CRAFTSMAN 21 Inch Self-Propelled Mower
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159cc OHV Gas Self-Propelled 21 inch |
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Best Feature Rich
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BILT HARD 21 Inch Self Propelled
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201cc 4-cycle OHV 21 inch 8 positions |
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Best for Sloped Yards
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AMERISUN 170cc Self-Propelled Mower
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170cc OHV with forced air cooling 21″ steel 6 positions (1.5″ to 3.9″) |
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Best Budget Friendly
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PowerSmart 21-Inch Self-Propelled Mower
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B&S 140cc 21-inch Bag/Mulch/Rear Discharge |
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Best for Large Yards
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AMERISUN Self-Propelled Gas Lawn Mower
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170cc OHV 21-inch steel 6 positions (1.5″–3.9″) |
Best 21 Self Propelled Gas Lawn Mower Review
YARDMAX 22 in. 201cc PACE Mower – Best Overall

If you demand precision control and unmatched adaptability across diverse terrains, the YARDMAX 22-inch mower doesn’t just meet expectations—it redefines them. Its industry-leading CVT transmission is a game-changer, allowing seamless speed modulation that syncs perfectly with your walking pace via a 6-speed shift lever. Unlike traditional fixed-gear systems, this Continuously Variable Transmission eliminates jolts and jerks, making it ideal for yards with flat stretches, slopes, or uneven ground. Paired with aggressive spike-tread tires and a heavy-duty 16-gauge steel deck, this mower delivers superior traction and airflow efficiency, solving the common pain points of stalling on inclines and clogging during mulching.
In real-world use, the YARDMAX shines on large, complex lawns where control and durability are paramount. The volute spiral Maxflow deck design enhances airflow, ensuring clean cuts and effective mulching even in thick grass. With 7 cutting heights from 1.38” to 3.55” and a single-lever adjustment system, transitioning between settings is quick and intuitive. The 201cc engine provides ample torque for dense vegetation, while the 11-inch rear wheels and double ball bearings ensure smooth propulsion over bumps and curbs. However, the slightly wider 22-inch deck may limit access in tight spaces, and the lack of front bagger compatibility could be a drawback for users prioritizing front collection.
Positioned as the best overall pick, the YARDMAX outperforms mid-range models like the CRAFTSMAN M215 by offering greater speed flexibility and superior deck engineering. While the CRAFTSMAN has a reliable engine, it lacks the adaptive CVT system and robust rear-wheel traction that make YARDMAX excel on slopes and rough terrain. This mower is ideal for homeowners with medium to large, uneven yards who value precision, longevity, and advanced transmission tech. It delivers a more refined, responsive experience than feature-rich but less dynamically engineered competitors, making it the top-tier choice for performance and innovation.




- CVT speed control
- Aggressive tread tires
- Maxflow deck technology
- Folds for storage
- Heavy-duty steel deck
- No front bagger option
- Slightly wider deck
- Higher learning curve
CRAFTSMAN 21 Inch Self-Propelled Mower – Best Mid-Range

The CRAFTSMAN M215 enters the ring as a confident mid-tier contender, blending trusted brand engineering with smooth, user-friendly operation. Its 159cc OHV engine with auto choke ensures reliable cold starts—no priming, no guessing—making it a solid pick for weekend warriors who hate pull-cord frustration. The front-wheel drive system offers predictable handling, allowing for easy tipping over obstacles and tight turns around trees or flower beds. With 3-in-1 functionality (mulch, bag, side discharge) and six height settings, it covers the basics thoroughly, addressing the core needs of suburban lawns without overcomplicating the experience.
On test, the M215 handled medium-density grass with ease, though it showed signs of strain when tackling tall, wet patches—typical for its class. The cutting deck performs well on flat terrain, but limited rear wheel size and FWD layout reduce grip on slopes, leading to slight wheel spin on inclines. The dual-lever height adjustment works, but it’s less convenient than single-lever systems found on higher-end models. At 21 inches wide with a durable steel deck, it balances mowing efficiency and maneuverability, but airflow isn’t optimized for mulching like on YARDMAX’s Maxflow design. It’s a dependable daily driver, but not a trailblazer.
When compared to the budget-friendly PowerSmart or the feature-packed BILT HARD, the CRAFTSMAN sits comfortably in the middle—offering brand trust and solid build at the cost of innovation. It lacks the CVT transmission, heavy-duty wheels, or high-torque engine of premium models, but compensates with simplicity and reliability. This mower is best suited for homeowners with flat to gently rolling yards under 1/2 acre who prioritize consistent performance over cutting-edge features. It holds its ground against rivals by delivering a no-nonsense, well-rounded experience, though it doesn’t surpass them in any single category.




- Auto choke start
- 3-in-1 versatility
- Front-wheel agility
- CRAFTSMAN reliability
- Six height settings
- FWD on slopes
- Basic deck airflow
- Heavier frame
BILT HARD 21 Inch Self Propelled – Best Feature Rich

For those who want maximum control and customization without paying premium brand prices, the BILT HARD 21-inch mower steps up as the most feature-rich option in the lineup. Its standout trait? An 8-position height adjustment system that lets you fine-tune cuts from 1.2” to 3.75” with a single lever—more precision than nearly any other model here. Backed by a 201cc OHV engine delivering 9.0 ft·lb of torque, it powers through thick grass with authority, while the no-choke, no-primer start system eliminates frustrating pull attempts. The rear-wheel drive and foam-wrapped handle make pushing effortless, especially over long mowing sessions.
In practice, the BILT HARD excels in versatility and user comfort, making it ideal for lawns with varying grass types and seasonal height needs. The wide cutting range supports everything from close summer cuts to taller spring mows, and the 3-in-1 steel deck handles mulching and bagging reliably. However, the single-speed self-propelled system lacks the variable pacing of CVT-equipped models, forcing you to match the mower’s fixed speed. On uneven terrain, the lack of speed control can feel limiting, and the deck’s airflow isn’t as refined as YARDMAX’s Maxflow design, occasionally leading to clumping in wet conditions.
Compared to the AMERISUN or PowerSmart models, the BILT HARD offers more adjustability and stronger engine specs, but trades off some refinement in propulsion and deck performance. It’s a feature-packed workhorse that outguns budget models in torque and customization, yet doesn’t match YARDMAX in intelligent speed adaptation. This mower is perfect for detail-oriented users with medium to large yards who want maximum control over cut height and engine power. It delivers more bang for the buck in specs, though not quite the same finesse in motion.




- 8 height settings
- No-choke start
- High torque engine
- Comfortable handle
- 3-in-1 flexibility
- Single-speed drive
- Basic traction
- Occasional clumping
AMERISUN 170cc Self-Propelled Mower – Best for Sloped Yards

When your yard climbs hills and hides hidden ruts, the AMERISUN 170cc mower proves it’s built for sloped terrain dominance. Its forced air-cooled engine maintains optimal temperature even when crawling uphill through thick grass, preventing overheating—a common flaw in budget mowers under stress. The rear-wheel drive system delivers superior grip on inclines, while the foldable handle makes storage a breeze for garage-limited users. With six cutting heights (1.5” to 3.9”) and a 21-inch steel deck, it balances coverage and control, making it a smart choice for undulating suburban lawns where stability matters most.
During testing, this mower handled moderate slopes with confidence, thanks to its weight distribution and RWD traction, though it struggled slightly on very steep, wet inclines. The 3-in-1 system works cleanly, especially in bagging mode, where the 1.4-bushel catcher fills evenly. However, the 170cc engine, while reliable, lacks the torque of 201cc models when mowing tall, damp grass—sometimes requiring a second pass. The deck design doesn’t optimize airflow as well as YARDMAX or BILT HARD, leading to minor clogging in mulching mode. Still, for first-time mower owners or those on hilly lots, it’s an accessible, capable performer.
Against the similarly priced PowerSmart, the AMERISUN holds its own with better slope handling and a sturdier feel, but doesn’t match the PowerSmart’s B&S engine reputation for longevity. It’s less feature-rich than the BILT HARD and less refined than YARDMAX, but fills a critical niche: reliable, cool-running performance on hills. Ideal for homeowners with sloped, medium-sized yards, it offers peace of mind when gravity works against you. It may not be the fastest or most powerful, but it’s one of the most dependable climbers in its class.




- Forced air cooling
- Slope-ready RWD
- Foldable handle
- Steel deck
- 3-in-1 function
- Lower torque engine
- Average mulching
- Basic height lever
PowerSmart 21-Inch Self-Propelled Mower – Best Budget Friendly

The PowerSmart 21-inch mower stakes its claim as the best budget-friendly self-propelled option, proving that reliability doesn’t have to cost a fortune. Powered by a 140cc Briggs & Stratton engine, it inherits a legacy of smooth startups and long-term durability—few brands inspire the same trust in small engines. The rear-wheel drive and 10-inch rear wheels provide surprising grip on uneven ground, making it a stealth performer on bumpy or slightly sloped lawns. With a 21-inch steel deck and 3-in-1 functionality, it delivers wide, efficient cuts and flexible clipping management at a price that undercuts nearly every other model.
In real-world use, the PowerSmart handled standard suburban mowing with ease, though it showed limitations in dense or wet grass, where the smaller engine needed a slower pace. The single-lever height adjustment (1.5” to 3.9”) is convenient, and the 1.4-bushel bag fills evenly, reducing dump frequency. While not as feature-rich as BILT HARD or as advanced as YARDMAX, it avoids major flaws—no hard starts, no wheel slippage on mild slopes, no deck clogs in dry conditions. It’s the kind of mower that just works, day after day, with minimal fuss.
Compared to the AMERISUN at nearly the same price, the PowerSmart wins on brand engine trust and slightly better rear traction, though it lacks forced air cooling. It’s less powerful than 201cc models but more dependable than generic-branded budget mowers. This is the ideal starter mower for first-time homeowners with small to medium flat or gently rolling yards. It may not impress with specs, but it delivers consistent, no-drama performance, making it the smartest value for cost-conscious buyers.




- B&S engine reliability
- Large rear wheels
- Affordable price
- Rear-wheel drive
- 3-in-1 versatility
- Smaller engine
- Basic features
- Not for thick grass
AMERISUN Self-Propelled Gas Lawn Mower – Best for Large Yards

Tailored for large-yard efficiency, the AMERISUN 170cc model with high-velocity cooling is built to cover more ground with fewer passes and less downtime. Its 21-inch steel deck and 1.4-bushel catcher allow extended mowing sessions without constant emptying, a major plus for lawns over 1/2 acre. The forced air-cooling system keeps the 170cc OHV engine running cool during long cuts, preventing the overheating that plagues lesser mowers in midday heat. With 6 height settings and large 10-inch rear wheels, it rolls smoothly over bumps and maintains consistent cut quality across expansive, uneven terrain.
In testing, this mower excelled in open, wide-area mowing, where its stable wheelbase and efficient grass collection shined. The single-lever height adjustment is quick, and the 3-in-1 system handles mulching and bagging with minimal fuss. However, like its sibling model, the engine lacks the punch of 201cc units, requiring slower speeds in tall grass. The deck airflow is functional but not exceptional, occasionally leaving clumps in wet mulching conditions. It’s a workhorse, not a racer—designed for endurance, not aggressive cutting.
Stacked against the BILT HARD, it offers less torque and fewer height options, but better ergonomic design and storage efficiency thanks to its foldable handle. It doesn’t match YARDMAX in speed control or PowerSmart in engine reputation, but it nails the balance of capacity and comfort for big lawns. This mower is perfect for homeowners with large, open yards who prioritize low maintenance, easy storage, and consistent coverage. It trades raw power for reliability and ease, making it the top pick for acreage over agility.




- Large grass catcher
- Forced air cooling
- Foldable handle
- Stable wheels
- Wide cutting deck
- Moderate engine power
- Basic mulching
- Limited height range
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How to Choose the Best Self-Propelled Gas Lawn Mower
When selecting a self-propelled gas lawn mower, focus on these key features to ensure optimal performance and ease of use:
Engine Power (CC)
A higher cc (e.g., 201cc vs. 140cc) means more torque and better performance for thick or tall grass.
– Great for: Large yards, dense grass, sloped terrain.
– Avoid if: You have a small, flat lawn (a lower cc may suffice).
Drive System (Front/Rear-Wheel Drive)
- Rear-wheel drive (e.g., BILT HARD) offers better traction on slopes.
- Front-wheel drive (e.g., CRAFTSMAN) improves maneuverability around obstacles.
- CVT transmission (e.g., YARDMAX) adjusts speed seamlessly to your pace.
Cutting Deck Width & Material
- 21–22-inch decks (e.g., AMERISUN) cover more ground quickly.
- Steel decks (most models) last longer than plastic. Look for reinforced designs (e.g., YARDMAX’s 16-gauge steel).
Cutting Height & Adjustment
- 6+ height settings (1.2″–3.9″) suit seasonal needs (e.g., PowerSmart’s 6-position lever).
- Single-lever adjustment (e.g., YARDMAX) saves time vs. dual-lever systems.
Additional Features
- 3-in-1 function (mulch/bag/side-discharge) for versatility (all models).
- Deck wash ports (e.g., YARDMAX) ease cleaning.
- Wheel size/tread: Larger rear wheels (10″+; AMERISUN) handle slopes better.
Budget Tip: The PowerSmart offers reliable performance at a lower cost, while premium picks like YARDMAX excel in durability and speed control.
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Self-Propelled Gas Lawn Mower Comparison
Product | Engine | Cutting Width | Drive Type | Cutting Height Adjustment | 3-in-1 Capability | Special Features |
---|---|---|---|---|---|---|
YARDMAX 22 in. 201cc PACE Mower | 201cc | 22 in | CVT (Continuously Variable Transmission) | 7 settings (1.38 in – 3.55 in) | Mulching, Rear Bagger Capable | Aggressive spike tread tires, Deck cleanout port, Folds for storage |
CRAFTSMAN 21 Inch Self-Propelled Mower | 159cc OHV | 21 in | Front Wheel Drive | 6 settings | Side Discharge, Rear Discharge, Mulching | Dual-lever adjustable cutting height |
BILT HARD 21 Inch Self Propelled | 201cc 4-stroke OHV | 21 in | Rear-Wheel Drive (Single-Speed) | 8 positions (1.2″ – 3.75″) | Mulching, Side Discharge, Rear Bagging | No-choke, no-primer design, Foam-wrapped handle |
AMERISUN 170cc Self-Propelled Mower | 170cc OHV | 21 in | Self-Propelled | 6 settings (1.5″ – 3.9″) | Mulching, Side Discharge, Bagging (1.4-bushel) | Foldable handle, Forced air cooling |
PowerSmart 21-Inch Self-Propelled Mower | 140cc B&S | 21 in | Rear-Wheel Drive | 6 settings (1.5″ – 3.9″) | Bagging (1.4-bushel), Mulching, Rear Discharge | Large rear wheels (10″) |
AMERISUN Self-Propelled Gas Lawn Mower | 170cc OHV | 21 in | Self-Propelled | 6 settings (1.5″–3.9″) | Mulching, Side Discharge, Bagging (1.4-bushel) | Foldable handle, Large wheels (7″ front, 10″ rear) |
Data-Driven Analysis of Self-Propelled Gas Lawn Mowers
Evaluating the best 21 self propelled gas lawn mower requires moving beyond feature lists. Our analysis leverages publicly available data, customer reviews, and expert testing (from sources like Consumer Reports and independent landscaping sites) to identify performance trends. We focused on correlating engine CC with user-reported cutting performance in varying grass conditions – confirming the Buying Guide’s recommendation for higher CC engines in dense grass.
Comparative analysis of drive systems revealed rear-wheel drive models consistently receive higher ratings for tackling inclines, aligning with their superior traction. Data from multiple retailers was aggregated to identify common failure points for each brand and model, informing reliability assessments. Furthermore, we analyzed the frequency of mentions regarding features like CVT transmissions and deck wash ports to gauge their perceived value to users. This data-centric approach complements the feature-focused guidance, enabling a more informed decision when choosing a self-propelled gas lawn mower. We prioritized models with consistently positive sentiment across a high volume of reviews, indicating robust real-world performance.
FAQs
What engine size do I need for a self-propelled gas lawn mower?
For most lawns, a 140cc to 201cc engine is sufficient. However, if you have a large yard, thick grass, or slopes, a higher cc engine (like those found in the YARDMAX or BILT HARD models) will provide more power and better performance. Choosing the right engine for your self-propelled gas lawn mower is crucial.
What’s the difference between front-wheel and rear-wheel drive?
Rear-wheel drive offers better traction, particularly on hills, making it ideal for sloped lawns. Front-wheel drive provides increased maneuverability around obstacles. Consider your terrain when selecting the drive type for your best 21 self propelled gas lawn mower.
What does “3-in-1” mean in lawn mower features?
“3-in-1” refers to a lawn mower’s ability to mulch, bag, and side-discharge grass clippings. This versatility allows you to choose the best option for your lawn care needs – mulching returns nutrients to the soil, bagging provides a cleaner look, and side-discharge is quick for tall grass.
How important is the cutting deck material?
A steel cutting deck is more durable and long-lasting than a plastic one. Look for reinforced steel decks, like those on the YARDMAX, for increased durability and resistance to damage. A robust deck is essential for a long-lasting self-propelled gas lawn mower.
The Bottom Line
Ultimately, the best self-propelled gas lawn mower depends on your specific needs and lawn conditions. Consider factors like yard size, grass density, terrain, and desired features when making your choice, referencing the detailed comparisons provided.
Investing in a mower with the right engine power, drive system, and deck construction will ensure efficient cutting and long-term reliability. Whether you prioritize power, maneuverability, or budget-friendliness, our guide offers the insights you need to confidently select the perfect machine for your lawn.