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Best robot lawn mowers 2021

Best robot lawn mowers 2021
(Image credit: Amazon)

The best robot lawn mowers make cutting your grass light work. That’s because the machines do all the hard work, whilst still giving you total control at the tap of a button. All you have to do is install or set the boundary wires the robotic lawn mower comes with – so the device knows where you would like it to cut – and then let it get to work. 

Before you choose the best robotic lawn mower, keep in mind what size of your lawn is. Is the area landscaped, and how often would you like your lawn to be cut? Many of the best robot lawn mowers for hills can manage slopes of around 30 to 40% inclines. While other robot mowers listed in our round-up perform best when they are used on flatter lawns.

Many of the top options also have automatic shut-off which stops the blades from cutting if the robot is tipped or a foreign object is discovered. The very best robot lawn mowers have bumper sensors, anti-theft features, and a handful come with GPS tracking should your robot go missing. As is to be expected, these models can be quite costly. We’ve reviewed the best robotic lawn mowers from the likes of well-known garden brands like MowRo, Worx, and Husqvarna. All of which can set you back anywhere between $2,600 to $900. 

Whether you are looking for the best robot lawn mower for hills, or the best robot lawn mower for large lawns, our roundup has it all. Or, if you’re looking for even more ways to keep your grass looking its best, check out our guide to the best lawn edgers

1. Husqvarna Automower 315X: Best robot mower overall 

Husqvarna Automower 315X review

(Image credit: Amazon)

Husqvarna Automower 315X

The Husqvarna Automower 315X is the best robotic lawn mower for added high-spec features.

GPS tracking 
Can take on slopes up to 40%
Have to pay more for extras

The Husqvarna Automower 315X is our top pick for a great all-rounder robot mower that’s packed full of features. As you would expect from the Swedish manufacturer, this X-line model is loaded with all the features any robotic lawn mower could need. This includes a GPS tracking system, LED headlights, and its own app: Automower Connect. It also has voice control, a spot cutting mode, and anti-theft features.

The Husqvarna Automower 315X is one of the smallest in the brand’s X-line series. But its small size doesn’t mean it has a small capacity. It can cut large gardens up to 1,600m2, plus handle inclines of up to 40% – which is pretty steep! 

But all these amazing functions means the model carries a steep price tag. It’s worth noting that this is the most expensive model in our line-up, costing around $2,500. You can find some great other robotic lawn mowers for cheaper, but the price won’t include all the added extras you get with the Husqvarna Automower 315X, like the installation of the boundary wires or LED headlights.

2. MowRo RM24A: Best value robot mower

MowRo RM24A review

(Image credit: Home Depot)

MowRo RM24A

The MOWRO RM24A is the most affordable lawn mower and the best mower for large hills.

Good value
Lots of safety features
Not suitable for large lawns

The MowRo RM24A is the cheapest lawn mower in this guide at $900 but handles the steep inclines (up to 30 degrees). It might not have all the fancy high-tech features other robotic lawn mowers come with, but it does ensure your lawn is consistently cut using its 48-hour cycle. 

You could say safety is of the MowRo RM24A’s best features. It has three blades which are tucked away in a protective Mowing Blade Guard. This guard allows grass to pass through but protects against foreign objects. It also has a bump sensor and automatic safety sensors which means the MowRo will reverse and stop the blades if it comes into contact with anything other than grass. 

Performance-wise, the MowRo RM24A robotic lawn mower takes 90 minutes to charge fully and can cut for two hours. You can also set a custom cutting height anywhere from 1 inch to 2.5 inches. If you have a medium-sized lawn with some slopes to it, this is the best robot lawn mower for you. 

3. Worx WR153 Landroid Robotic Mower: Best robot lawn mower for large gardens 

Worx WR153 Landroid Robotic Mower review

(Image credit: Amazon)

Worx WR153 Landroid Robotic Mower

The Worx WR153 Landroid is a great choice if you have a large lawn.

 Ideal for medium to large lawns 
Long charge time
Not great for edges

The Worx WR153 is a great choice if you’ve got a medium or large-sized lawn.

Thanks to its clever AIA intelligent navigation technology, this robot mower can cut narrow passageways with ease.

Because this robot mower is smart-enabled, you’ll be able to set it to work via your phone using the app. The Worx WR153 doesn’t mow in straight lines, but instead, works its way across your grass using a zig-zag motion so that the grass is evened out and looks uniform. 

Suitable for gardens up to half an acre, this Worx robot mower is also fitted with safety features which mean the blades stop if the mower is picked up or tilted off the floor - great for if you have animals or small children. One fault we did find with this mower, however, is that it’s not great for reaching right to the edges of the lawn. 

4. Gardena 4069 R80Li robotic lawn mower: Best quiet robot lawn mower 

Gardena 4069 R80Li review

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Gardena 4069 R80Li robotic lawn mower

The Gardena 4069 R80Li robotic lawn mower works quietly and does a thorough job.

Anti-theft protection 
No app controls

One of the most talked about features of the Gardena 4069 R80Li robotic lawn mower is its quietness. It operates at 60dB, which is the same level of noise of a normal conversation. The average gas-operated lawn mower operates at 90dB, so if you are looking for a quiet mower, this is the best robot lawn mower for you.

Gardena is a member of the Husqvarna Group – so you can expect many of the high-tech features that come with our top pick model too. This includes: rain sensors, anti-theft protection and SensorControl (SILENO+). The latter monitors how quickly your lawn grows and only mows when it needs to be cut.

However, it is worth highlighting this machine is tailored for small lawns with tricky corners. It cuts a total working area capacity of 8611 sq. ft. and it’s emission-free!

5. Worx WR140 Landroid M 20V: Best robot mower for small lawns 

Worx WR140 Landroid M 20V Robotic Lawn Mower review

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Worx WR140 Landroid M 20V:

The Worx WR140 Landroid M 20V is great for smaller lawns and tight corners.

AIA technology  
Good value
 No remote-control capabilities 
Can't be used in the rain

If you are looking for the best robot lawn mower for small lawns that have narrow passageways, you’ll find it in the Worx WR140 Landroid M 20V. That’s because the small device comes with patented AIA technology. This tech enables it to manoeuvre around narrow passageways with a minimum width of 60cm. This lawn mower also doesn’t cut grass in straight lines, but instead, cuts the grass in a zig-zag motion so that the lawn is nice and even. Because of this motion, Worx also claims it can cut your 30% faster than other robot mowers.

The Worx WR140 Landroid M 20V robot lawn mower is also ideal for cutting right up to the edge of flower beds and borders thanks to its 7-inch offset blade. This blade is positioned towards the side of the device meaning that there is less tidying up of the borders for you to do.   

With a typical mow time of 50 minutes and a cutting capacity of up to 700m2), the Worx WR140 Landroid is a great option if you have a small lawn with a little incline to it. 

How to choose a robot lawn mower

First, consider how big your yard is and make sure the mower can handle it daily. Our best pick can mow up to 0.4 acres of grass – not including your house or other structures on your property – which is the top end of the models we evaluated. Others we reviewed can handle anywhere from 0.25 to 0.33 acres, which is sufficient for small to medium-size lawns.

If you have a hilly yard, pick a model that can climb up and down the inclines with ease. The mowers we reviewed can handle slopes between 22 degrees and 30 degrees, depending on the model. However, the dealers we spoke to say they’ve seen some models handle almost 45-degree inclines with little difficulty.

Even though you generally won’t notice how often your robot lawn mower returns to its base or how long it stays there, you should consider how long it takes to charge the battery, as well as how long the machine runs with a full battery. The best mowers we reviewed last about an hour right off the charger and take a little longer than that to recharge. Battery life doesn’t affect your experience or the results, but it’s a good indicator of how well the machine is designed.

Multizone capability

Not all automatic lawn mowers travel to distinct, separate areas to cut grass – for that, you need one with multizone capability. This feature is necessary if your home or business has a small front lawn and larger back lawn that is not directly connected. In this scenario, each lawn is considered a zone. Most multizone robot mowers cover two to four zones.


Programmable mowers can be scheduled to run on particular days at specific times. When buying a robot mower, consider how you program it and what you want it to do. You program some units from the mower base, and others can be set remotely over a Bluetooth or Wi-Fi connection.

Advanced features

As convenient as most robotic lawn mowers are, there are features that put some a cut above the competition. Some models include GPS features that map your yard and track your mower if someone steals it. You can control, configure, and monitor some machines from anywhere you have an internet connection via a mobile app. Some also have rain-detection technology that senses when it’s too wet to mow – a few even continue mowing during a shower.


Considering how expensive these robot lawn mowers are, you should consider the length of the warranty. If a model breaks down early in its life span, you may be able to replace or repair it for free if you’ve registered your warranty properly. Plus, a longer warranty provides peace of mind that the manufacturer is confident the product will last a long time.

Warranty periods vary quite a bit for robot lawn mowers. The shortest warranty in our comparison was one year, for the McCulloch ROB 1000. The Worx WG794 boasts a much longer, three-year warranty. And the five-year warranty for the Denna L600 was the longest warranty in our comparison.