Short answer: Makers build in safety features, but no feature makes a robot mower safe in every situation, and we cannot promise it. Treat the mower as a machine with moving blades. Supervise, keep children and pets away while it runs where the maker advises, and read the manual for your specific model.

We do not test robots. This article describes what makers commonly claim and offers general advice. It is not a safety certification, and it does not replace the manual.

What do makers say about safety?

Makers of robot mowers often describe a set of features. Which ones a model has, and how well they work, varies. These are the common claims:

  • Blade stop when lifted. The blades are meant to stop if the mower is picked up.
  • Blade stop when tilted or flipped. A tilt sensor is meant to stop the blades if the mower leans too far or turns over.
  • Bump or obstacle sensors. The mower is meant to detect something in its way and turn, or stop. Some models use cameras or other sensors for this too. How reliably they detect objects depends on the model and the conditions.
  • Small blades. As we explain in our article on blades, the blades are typically small and light, and are often designed to swing.
  • Stop button and lock. Many mowers have a stop control and a PIN or lock to stop unauthorized use.
  • Slow movement. Robot mowers generally move slowly, compared to a push mower.

These are maker claims, not our findings.

What does that NOT mean?

A feature on a spec sheet is not a guarantee. Some things to keep in mind:

  • Sensors may not detect every object, person or animal, especially small, low or still ones, or in poor light, rain or tall grass.
  • A blade-stop feature depends on the mower detecting the lift or tilt. Do not assume it will react in time.
  • Small blades can still cut. Never put hands or feet near the underside of a mower that is on.
  • A feature that works well in a maker's description may not behave the same way in your yard.

We do not have safety statistics for robot mowers, and we do not make claims about how often accidents happen.

How can I reduce risk at home?

Here is general advice. The manual for your model comes first.

Before you buy

  • Look at the safety section of the manual online, if the maker has published it.
  • Ask about the safety features of the specific model, not just the brand. See the buying checklist.

Around children

  • Do not let children play on or near the lawn while the mower is running, where the maker advises.
  • Teach children not to touch, ride or lift the mower.
  • Never allow a child to handle the underside.

Around pets

  • Keep pets off the lawn while it runs, where the maker advises, especially curious animals that chase or sniff moving objects.
  • Introduce the mower to pets while it is switched off or docked, so they get used to the shape.
  • Be careful with small or slow-moving pets.

Around the yard

  • Remove toys, hoses, tools and other items before each run.
  • Schedule mowing for times when nobody is out in the yard.
  • Stay nearby when you first use the mower, so you can see how it behaves.
  • Switch the mower off before you pick it up, clean it or touch the blades.
  • Check the safety features from time to time. Test them only as the manual describes.

What about wildlife?

Small animals and garden wildlife can be at risk, especially at night, so many owners choose daytime schedules. Animals that curl up or freeze when startled may not move out of the way. Before a run, it can help to check the lawn and edges, especially long grass and hedge bases. Some makers give their own advice on night operation, so look in the manual.

What this means for you

A robot mower is a useful tool, but it is not a toy and not a pet. Supervise it like any garden machine, and plan runs when no one is around. If you have small children or very curious pets, think carefully about how you will manage the lawn before you buy.

For the details-minded

  • Safety standards for household robot mowers exist, and makers may say a model meets them. We do not verify those claims, so ask for the maker's documentation if it matters to you.
  • Maker safety features usually appear in the manual and on the spec sheet. Sensor type, tilt angle and blade-stop delay are not consistently published, so we do not compare them.
  • Navigation that avoids obstacles is a separate topic from blade safety. See how robot mowers navigate.

Next step

If you are weighing up which type of mower fits a family yard, try our short quiz at /help-me-choose/.

Quick answers

Is a robot mower safe to run while kids play outside? We cannot say it is. Many makers advise keeping children off the lawn while it runs. Check your manual.

Will the blades stop if a child or pet touches the mower? Makers commonly claim the blades stop if the mower is lifted or tilted. That is not a guarantee, so supervise and keep people and pets away.

When is the best time to run it? When nobody is in the yard. Many owners choose daytime, partly because small wildlife can be at risk at night.

Can I rely on the bump sensors? Treat them as an extra layer, not as the only protection. They may miss small, low or still objects.