Can robot mowers be left outside? Yes during the mowing season, but most makers advise indoor storage over winter. Keep the mower above freezing, at 0°C (32°F) or warmer, in a dry place once the cutting season ends. Weather-resistant is not the same as waterproof.
The short answer
- Season: robot mowers are designed to stay outdoors while they cut grass.
- Winter: store the mower indoors, above freezing, in a dry place.
- Charging station: bring standard stations and power supplies inside; some outdoor-rated bases can stay out.
- Rain: check the IP rating in your manual. Rain is one thing, standing water is another.
Can robot mowers be left outside during the mowing season?
During the mowing season, robot mowers are designed to stay outside. Anker’s UK guide on robot mower water resistance says so directly, and the brand notes that some mowers can detect rainfall and send themselves back to the charging station.
If you are asking whether a robot mower can be left outside between cuts, the guidance is consistent for the season: the mower is meant to live outdoors and returns to its station only to charge. Our reading is that the area around the station should stay clear of standing water, so the mower can dock cleanly on each run, and our guide to where to put the charging station covers siting it. For how the mower behaves once rain starts, see whether robot mowers work in rain.
Weather-resistant does not mean fully waterproof. Anker describes most robot mowers this way, and says they are not built to sit in puddles or flooded areas. Wet grass is a separate issue: it bends over more easily, sticks underneath the cutting deck, and mowing in wet conditions is not always ideal (see robot mowers and wet grass for the details).
Why winter outdoor storage causes problems
Winter is where most guides draw the line on whether robot mowers can be left outside. STIHL’s UK winter guide says a mower needs to be stored indoors over winter, because low temperatures, snow and rain can damage its electronics. Anker adds that freezing temperatures, prolonged rain, frost and saturated ground all put extra stress on the battery.
So, can robot mowers be left outside through a hard winter? Brands set different conditions, but none of the sources here recommends leaving a standard mower exposed to frost, snow and wet ground for the whole season.
Anker’s wording is that leaving a robot mower outside all winter is usually not recommended. The practical rule is simple: keep the mower out of the cold, out of the wet, and off frozen ground until spring.
Our reading is that a mower with no cutting job in winter gains little from staying outside and can pick up moisture, frost and corrosion risk. Bringing it in for the off-season avoids most of those risks, and it fits the storage steps below.
Temperature and timing limits to know
Manufacturer guides give the clearest numbers. Husqvarna’s winter storage guide asks for indoor storage in a dry environment above freezing, meaning above 0°C (32°F). STIHL goes a step further and says the storage area should not drop below 5°C.
| Limit | Figure | Source |
|---|---|---|
| Storage temperature | Above 0°C (32°F) | Husqvarna |
| Storage area floor | Not below 5°C | STIHL |
| Last cut | Before the first frost, when temperatures are regularly below 10°C | STIHL |
| Grass height before winter | About 6 to 8 cm (2.4 to 3.1 in) | Husqvarna (AU guide) |
The last-cut dates in the UK guidance fall in late October or early November. Those dates suit UK gardens, so check your local first-frost date before you plan the final cut, and see when the robot mower season starts and ends for timing.
Brands do not agree on one threshold. Mammotion’s winter storage guide says the mower must be moved indoors once the outdoor temperature drops below -10°C (14°F), and it lists a recommended storage range of -10°C to 40°C (14°F to 104°F). That is a lower floor than the 0°C line in Husqvarna’s guide, so the number in your model’s manual is the one to follow.
What to do with the charging station and power supply
Can robot mowers be left outside with their charging stations? This is the part where brands differ most. Husqvarna advises storing standard charging stations and the power supply indoors, with the power supply disconnected and kept in a dry, frost-free place. Its NERA charging station is an exception: the baseplate is designed to remain outdoors, and only the top needs indoor storage.
| Part | Winter position | Source |
|---|---|---|
| Standard charging station | Indoors | Husqvarna |
| Power supply | Indoors, disconnected, frost-free | Husqvarna |
| NERA baseplate | Outdoors; top stored indoors | Husqvarna |
| EPOS reference station (wire-free) | Outdoors year-round, with the power supply kept connected if left outdoors | Husqvarna |
| Station left on the lawn | Mains disconnected and covered with a secured bucket or crate | STIHL |
The EPOS reference station is rated for storage from -20°C to 70°C (-4°F to 158°F), which is why Husqvarna treats it as weatherproof. Our reading is that the safest default for any model is to check the manual first, because the outdoor-rated parts above belong to specific systems.
Rain, wet grass and IP ratings: what outdoor use allows
Can robot mowers be left outside in the rain? Only within the limits of their IP rating. An IP rating gives two numbers. The first describes protection against dust and solid particles, and the second describes water resistance. Anker’s UK guide suggests IPX5 as a sensible starting point for most UK gardens, and our guide to robot mower IP ratings goes further. The codes below show what each one means.
| Code | What it means |
|---|---|
| IPX4 | Protected against splashes from any direction |
| IPX5 | Protected against low-pressure water jets |
| IPX6 | Protected against stronger water jets and heavier rain |
| IPX7 | Protected against temporary water immersion |
The “X” in a code such as IPX5 means the mower was not officially tested for dust protection. A good water rating still does not mean the mower is built for puddles. Anker also warns that leaving a mower in heavy rain or waterlogged ground for long periods can increase wear.
How to store the mower for winter
Storage is the step that matters most when the season ends. Husqvarna and STIHL give similar instructions, and the steps below follow them.
- Clean the mower. Anker advises cleaning it thoroughly before storing it somewhere dry.
- Charge it fully and switch it off. Husqvarna asks for this before storage, and STIHL says to fully charge the battery after its last use to prevent deep discharge. Mammotion’s guide sets a lower bar of at least 80 percent charge, so check which figure your model’s manual gives.
- Pick a dry place above freezing. Husqvarna strongly advises a garage, shed or basement, and the temperature should stay above 0°C (32°F).
- Rest it on all wheels on a flat surface, or use a wall hanger if your model has one.
- Follow the charging schedule. Husqvarna says most models need no charging in storage, but some older models need charging every three months.
- Fit new blades before the next season. Husqvarna says new blades and screws prevent rust and keep the cutting edge sharp.
So can robot mowers be left outside? In the mowing season, yes. Over winter, bring the mower and its standard charging station indoors, and follow the manual for your model.
Frequently asked questions
Can a robot mower stay outside in the rain?
Robot mowers are designed to stay outdoors during the mowing season, and many can detect rainfall and return to the charging station. Standing water and long periods of heavy rain are different. Anker says mowers are not designed for puddles and that heavy rain or waterlogged ground can add wear.
Is a robot mower waterproof?
Usually not fully. Anker describes most robot mowers as weather-resistant rather than waterproof. The IP code shows the protection level, such as IPX5 for low-pressure water jets. Check the rating in your manual before you decide how exposed the mower can be.
Can I leave the charging station outside all winter?
It depends on the model. Husqvarna advises storing standard charging stations and power supplies indoors, but its NERA baseplate and EPOS reference station are designed for outdoor use. STIHL says a station can stay on the lawn if the mains cable is disconnected and the station is covered.
What temperature is too cold to store a robot mower outside?
Husqvarna asks for storage above freezing, at 0°C (32°F) or warmer. STIHL says the storage area should not drop below 5°C. Freezing temperatures and frost are the main risks for the battery and electronics, according to Anker and STIHL.
Sources
- Husqvarna Automower winter storage guide (manufacturer): indoor storage, above-freezing storage, full charge before storage.
- Husqvarna Automower winter maintenance and storage (AU) (manufacturer): NERA baseplate, EPOS reference station, grass height.
- STIHL robot lawn mower winter storage (manufacturer): last-cut timing, 5°C storage floor, charging station on the lawn.
- Mammotion winter storage guide (manufacturer support): -10°C indoor threshold, storage range, 80 percent charge before storage.
- Anker robot lawn mower waterproof guide (brand blog): weather-resistant rating, IP codes, rain and winter guidance.
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