This popular size combines a practical cut with drive assistance to reduce user effort. For many homeowners, a 21 self propelled lawn mower is the perfect sweet spot. It’s wide enough to cover ground fast but still nimble for navigating around flower beds. The self-propelled feature is a true game-changer, especially if your yard has any slopes or uneven patches. You guide it, and the mower does the hard work of moving forward.
So, is this the right mower to make your weekend chores easier? We tested a top model to see how it handles real-world lawns. From power to bagging performance, here’s what we found out about where it excels and where it might fall a bit short for your specific needs.
Product Comparison Table: 9 Best 21 Self Propelled Lawn Mower
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Greenworks 40V 21″ Self-Propelled Cordless Lawn Mower – Brushless…
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9.8 |
Read Review |
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EGO Power+ Electric Lawn Mower, Self-Propelled Cordless with Touch…
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9.5 |
Read Review |
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Greenworks 60V 21″ Self-Propelled Cordless Lawn Mower, Brushless Motor,…
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9.2 |
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YARDMAX 22 in. 201cc Select PACE 6 Speed CVT…
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9.0 |
Read Review |
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BILT HARD 21 Inch Self Propelled Gas Lawn Mower,…
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8.7 |
Read Review |
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PowerSmart 21″ B&S Engine 140cc Self-Propelled Lawn Mower –…
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8.4 |
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PowerSmart 21″ 2-in-1 Push Lawn Mower, 144cc Engine,Mulching, Bagging,…
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8.2 |
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WORX Nitro 21″ Cordless Lawn Mower, Electric Mower with…
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7.9 |
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Ezasin 21″ Self-Propelled Gas Lawn Mower, 170cc 4-Stroke Engine,…
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7.6 |
Read Review |
Quick Review For Top 9 21 Self Propelled Lawn Mower
Greenworks 40V 21" Self-Propelled Cordless Lawn Mower – Brushless Motor, 5.0Ah Battery & Charger(75+ Tool Compatible)
The Greenworks 40V 21″ Self-Propelled Cordless Lawn Mower is designed to be a straightforward upgrade from gas or basic electric mowers, focusing on convenience and performance. It centers around a powerful brushless motor that provides the torque needed for thick grass while operating significantly quieter than traditional gas models—about three times quieter, which is a major plus for residential neighborhoods.
This motor, combined with the included 5.0Ah battery, delivers a solid runtime to handle typical lawns on a single charge, and the durability is backed by a 3-year warranty for both the tool and the battery.
One of the key features is the self-propelled rear-wheel drive system. It takes the physical effort out of mowing, especially on slopes or uneven ground. You can ajust the speed with a simple dial, letting you match your walking pace for a consistent cut without rushing.
The 21-inch steel deck is a standard width, balancing maneuverability with efficiency, so you can cover ground without constantly weaving around obstacles.
Versatility is a strong point with its 4-in-1 function. You can choose to mulch clippings back into the lawn for nutrients, use the included grass bag for a clean finish, employ side discharge for longer grass, or activate a turbo mode for effective leaf pickup in the fall.
EGO Power+ Electric Lawn Mower, Self-Propelled Cordless with Touch Drive, Includes 56V 7.5Ah Battery and Rapid Charger – LM2125SP
The EGO Power+ LM2125SP Self-Propelled Cordless Lawn Mower is designed to change how you think about cutting your grass. It combines the freedom of cordless operation with the power and convenience that can make lawn care less of a chore. At its core is a high-efficiency brushless motor that delivers serious performance, providing cutting torque that actually exceeds many traditional gas-powered mowers.
This means you get clean, consistent cuts even in tough or thick grass without the noise, fumes, and maintenance of a gas engine.
One of the standout features is the intuitive Touch Drive self-propelled system. Instead of a lever you have to constantly squeeze, you simply press the touch-sensitive pad on the handle with your palm to engage the drive. A dial right by your thumb lets you scroll smoothly through speed settings, from a leisurely walk to a brisk pace.
It gives you precise control with minimal effort, making hills and large lawns much more managable. Starting the mower is just as simple, thanks to a quick push-button start—no pulling a cord ever again.
Powering this system is the included 56V 7.5Ah ARC Lithium battery. On a single charge, it provides up to 60 minutes of runtime, which is enough to tackle a significant sized lawn.
Greenworks 60V 21" Self-Propelled Cordless Lawn Mower, Brushless Motor, LED Lights, Includes 2X 4.0Ah Batteries & Rapid Dual-Port Charger(75+ Tool Compatibility, 45Min Runtime)
The Greenworks 60V 21″ Self-Propelled Cordless Lawn Mower is designed to make lawn care simpler and more efficient, without the hassles of gas. It’s a powerful, all-in-one system that gives you the freedom to mow on your terms, and it starts with the included dual batteries and rapid charger. You get a full 45 minutes of runtime right out of the box, which is plenty for most medium to large yards. One of the biggest advantages is the self-propelled rear-wheel drive.
It means you don’t have to push the mower yourself, especially on hills or through dense, thick grass. You can easily adjust the speed with a simple lever, letting you set a comfortable walking pace for precision control. It takes the physical strain out of mowing, so you finish faster and with less effort. This mower is notably quieter than traditional gas models—about three times quieter, in fact. There’s no loud engine roar, no fumes, and no need for messy oil or gas.
You get instant starts with just a button press, and it’s virtually maintenance-free. No more pull cords, spark plugs, or winterizing. It’s a peaceful, eco-friendly way to care for your lawn that your neighbors will appreciate. The built-in LED headlights are a practical feature that let’s you mow early in the morning or later in the evening when its cooler outside, giving you more flexibility in your schedule.
YARDMAX 22 in. 201cc Select PACE 6 Speed CVT High Wheel FWD 3-in-1 Gas Walk Behind Self Propelled Lawn Mower, Black (YG2860)
The YARDMAX YG2860 22-inch 3-in-1 Gas Walk Behind Mower is built to make mowing your lawn a more controlled and less strenuous task. At its heart is a feature that truely sets it apart: the exclusive Select PACE CVT transmission. Unlike traditional fixed-speed self-propelled mowers, this system gives you six distinct speed settings controlled by a simple lever.
This means you can precisely match the mower’s forward pace to your natural walking speed, whether your moving slow around delicate flower beds or picking up the pace on open stretches. You’re in comand, not the other way around.
Getting that superior traction to actually use that control is where the next exclusive feature comes in. The YARDMAX is equipped with large, rubber tires that have an aggressive spiked tread pattern. These aren’t your average smooth mower wheels.
They dig in on hills, wet grass, and loose soil to prevent slipping and give you confident maneuverability. You’ll notice the difference when turning or navigating slopes, as the mower holds its line without struggling.
We all know the frustration of a mower that won’t start. The YG2860 adresses this with an automatic choke system. There’s no separate primer bulb or choke lever to fiddle with.
BILT HARD 21 Inch Self Propelled Gas Lawn Mower, 201cc 4-Cycle OHV Engine, 3-in-1 Functions (Bagging, Mulching and Side Discharge) with 8-Positions Adjustable Cutting Height, Easy Start
The BILT HARD 21 Inch Self Propelled Gas Lawn Mower is built to handle your lawn care with a focus on power, ease, and adaptability. It centers around a 201cc 4-cycle OHV engine, a design known for its durability and consistent power output. This engine provides the reliable torque needed to cut through thick grass and tall weeds without stalling, ensuring you can complete your mowing in one go.
The no-choke, no-primer starting system is a key feature, aiming to eliminate the common frustration of pulling a starter cord repeatedly. You should find it starts up quickly with minimal effort.
Its 3-in-1 functionality gives you control over how you manage your clippings.
You can choose to bag them for a clean finish, use the side discharge for faster mowing over large areas, or engage the mulching feature to naturally fertilize your lawn by recycling fine clippings back into the soil. The 21-inch steel cutting deck offers a balance between maneuverability and coverage, allowing you to cut a wide path and reduce the number of passes you need to make.
One of the mowers most significant features is its self-propelled rear-wheel drive.
PowerSmart 21" B&S Engine 140cc Self-Propelled Lawn Mower – Durable Steel Deck, 6-Height Adjustments, 3-in-1 Mulching Versatility
The PowerSmart 21″ B&S Engine 140cc Self-Propelled Lawn Mower is designed to make your weekly lawn care a straightforward and reliable task. It combines a trusted power source with practical features that adapt to how you like to maintain your yard. At its heart is a powerful 140cc Briggs & Stratton engine. This is a workhorse motor known for its durability, and it’s paired with an auto-choke system to make starting remarkably simple.
You just pull the cord—no priming needed—and it fires up reliably, even if it’s been sitting for a while. The self-propelled drive takes the strain out of pushing, especially on slopes or larger lawns, so you guide it instead of wrestling with it. The mower’s 21-inch cutting deck is built from robust alloy steel. This construction resists bumps and wear, ensuring the mower lasts for seasons to come.
Under that durable deck, you have full control over your lawn’s look with six different cutting height settings. You can easily raise or lower the wheels to cut your grass shorter in the spring or leave it a bit longer to stay healthy during the hot summer heat. One of it’s most versatile features is the 3-in-1 capability. You can choose the method that suits your task best. For a clean, manicured finish, attach the large-capacity grass bag to collect clippings neatly.
PowerSmart 21" 2-in-1 Push Lawn Mower, 144cc Engine,Mulching, Bagging, High Wheels, Lightweight and Easy Assembly,6 Cutting Height, Lightweight,for Garden Yard
The PowerSmart 21″ 2-in-1 Push Lawn Mower is designed to make your lawn care routine straightforward and effective. It centers around a reliable 144cc OHV engine, which provides consistent power to tackle your grass without bogging down. This kind of engine is built for durability, so you can expect it to start reliably and run smoothly season after season, giving you a clean cut each time you mow. One of the mowers key features is its 2-in-1 functionality.
You can choose to collect clippings in the rear bag for a tidy, clean finish with easy disposal. Or, you can use the mulching feature, which finely chops grass clippings and returns them to the soil as natural fertilizer. This helps retain moisture and improve your lawns health over time, promoting a thicker, greener yard without the need for extra products. Maneuverability is a major highlight here.
Weighing only 62 pounds, this mower is notably lightweight for its class, making it much easier to push and turn than many heavier models. The high wheels roll smoothly over uneven ground, helping you navigate around garden beds, trees, and tight corners without straining your back. Its a practical choice for small to medium-sized yards where agility matters. You have full control over your lawns look with six cutting height positions.
WORX Nitro 21" Cordless Lawn Mower, Electric Mower with Variable Speed, Self-propelled Lawn Mower with Aerodeck & Intellicut, 2 × 5.0 Ah Batteries & Charger Included, WG760
The WORX Nitro WG760 21″ Cordless Lawn Mower is a self-propelled electric mower designed to handle lawns up to half an acre with notable efficiency and user comfort. It’s built around a system of integrated technologies aimed at simplifying your lawn care.
At its core is the Aerodeck cutting deck. This vented design actively manages airflow under the mower.
It helps prevent the common frustrations of clogging and grass clumping, which leads to a cleaner cut and means you spend less time going over the same patches. The improved airflow also helps maximize the collection in the included bag.
Powering this mower is a Brushless Motor 2.0, which WORX states provides 40% more power and 10% longer runtime than their first-generation brushless motors. This power is supplied by two included 20V 5.0Ah PowerShare Pro batteries.
A significant benefit here is the PowerShare platform; these same batteries are compatible with over 140 other WORX tools and outdoor products, offering a lot of flexibility for your toolkit.
One of the key features is the self-propelled drive with variable speed. You set your pace, up to 3.7 MPH, and the mower moves itself forward. You just guide it. This is complemented by Intellicut Technology.
Ezasin 21" Self-Propelled Gas Lawn Mower, 170cc 4-Stroke Engine, 7-Position Cutting Height, 3-in-1 Versatile Mulching Bagging Discharging, 1.9 Bushels Large Grass Collector
The Ezasin 21″ Self-Propelled Gas Lawn Mower is built to handle your medium-sized lawn with a focus on power and ease. At its core is a 170cc 4-stroke engine that provides reliable starting and consistent power, so you can cut through thicker patches of grass without the mower bogging down. It’s designed for dependability season after season. You get a versatile 3-in-1 system for managing your clippings.
You can choose to bag them into the sizable 1.9 bushel collector for a clean finish, use the mulching plug to return nutrients back to your soil, or opt for side discharge when the grass is extra tall or wet. This flexibility lets you adapt to whatever condition your lawn is in. The 21-inch cutting deck is made from stamped steel and covers a good amount of ground with each pass, which helps you finish the job faster. The blade spins at 2900 RPM to ensure a clean, even cut.
Adjusting the cut height is straightforward with the single-lever system, offering seven positions from 1 inch up to 3 inches. This allows you to cut it short or leave it longer to promote deeper roots and healthier grass, depending on the time of year. Maneuvering is where this mower really shines, thanks to its self-propelled drive and high-wheel design. The 10-inch rear wheels and 8-inch front wheels roll easily over bumps and uneven spots in your yard.
21 Self Propelled Lawn Mower Buying Guide
A 21-inch self-propelled mower combines a standard cut with powered ease. It’s teh go-to for medium-sized lawns where you want a break from pushing but don’t need a massive machine. The self-drive feature does the heavy work, letting you guide it with minimal effort, especially on slopes or longer grass.
Drive System Type
Not all self-propelled systems are the same. Front-wheel drive offers better maneuverability for flat lawns. Rear-wheel drive provides superior traction and control on hills or uneven terrain. Consider your yard’s layout—if you have any incline, rear-wheel drive is often the more reliable choice.
Engine Power & Reliability
Look for a solid engine from a reputable brand, like Honda or Briggs & Stratton. Power is measured in cubic centimeters (cc). For a 21-inch deck, an engine between 140cc and 190cc is typically sufficient. A more powerful engine handles thick grass better and tends to last longer, which is a key factor for long-term value.
Cutting & Deck Adjustments
Check how easy it is to change the cutting height. A single lever that adjusts all wheels at once is a huge time-saver compared to adjusting each wheel individually. Also, consider the deck material; steel is durable, while polymer decks resist rust and are often lighter.
Grass Handling & Disposal
How does it manage clippings? Side-discharge is simple, mulching returns nutrients to the soil, and bagging gives a clean finish. Many mowers offer 2-in-1 or even 3-in-1 capabilities. Think about your preference. A large, easy-to-remove bag is a blessing if you collect grass.
Comfort & Ease of Use
You’ll be holding this for a while. Look for padded handles and intuitive controls. The speed control should be easy to operate with your thumb. A mower that starts reliably—whether with a key electric start or a simple pull-cord—makes every job beging more pleasantly.
Frequently Asked Questions About 21 Self Propelled Lawn Mower
What does “self-propelled” mean?
It means the mower drives itself forward. You just guide it. You don’t have to push, which makes mowing hills and large lawns much easier.
Why choose a 21-inch model?
A 21-inch cutting deck is a great middle ground. It’s wide enough to cover area quickly but still maneuverable for getting around tight spots like trees and garden beds.
Are they hard to maintain?
Not really. Basic care is similar to a push mower. You’ll need to change the oil, clean the air filter, and keep the blade sharp. Your manual will have a simple schedule to follow.
What kind of engine is best?
Most have reliable gas engines. Look for a good horsepower (HP) rating, as this helps with thick grass. Some newer models offer battery power, which is quieter and needs less routine maintenance.
How do you control the speed?
There’s usually a lever or dial on the handle. You set the walking pace you want, and the mower matches it. This is a key feature for comfort on different terrains.
Can it handle tall or wet grass?
They handle it better than push mowers, but it’s still tough on any machine. For the best results and a healthier lawn, it’s better to mow when the grass is dry and not let it get too tall between cuts.
Where should I store it?
Keep it in a clean, dry place like a shed or garage. This protects the engine and deck from rust. Always let the mower cool down completely before you put it away.
Is it worth the extra cost?
If you have a sloped yard or a large, flat area, the reduced physical effort makes it very worth it. For a very small, flat lawn, a push mower might be sufficent.
Closing Thoughts
Choosing a 21-inch self-propelled mower means easier handling on varied terrain, a strength of these concluding selections. It’s a tool that takes the heavy pushing out of the job, letting you focus on steering and getting a clean cut. You’ll save time and energy, especially on slopes or larger yards. The key is to match the mower’s features—like drive speed settings and engine power—to your specific lawn’s needs. That way, you get a helper that truly fits.
In the end, the right 21 self propelled lawn mower becomes a reliable partner for your weekend chores. It takes a tough task and makes it much more manageable. With good care and regular maintenance, a quality model will serve you well for many seasons. You can look forward to a neat, even lawn without the usual ache and fatigue. It’s a smart upgrade that makes a noticeable difference in your routine.