To store a robot mower for winter, you need to clean it thoroughly, remove and store the battery in a cool, dry place, and keep the mower itself in a frost-free location. This process prevents battery damage, corrosion, and mechanical issues that can arise from freezing temperatures and moisture. Proper winter storage ensures your robot mower will be ready to mow when spring arrives.

Why Winter Storage Matters for Your Robot Mower

Robot mowers are designed for outdoor use, but they are not built to survive freezing conditions with wet blades, a full battery, or debris trapped inside. Cold temperatures can cause battery cells to degrade permanently, and moisture left in the chassis can freeze and crack plastic components. Taking a few simple steps now saves you from expensive repairs or a replacement in the spring.

Step 1: Clean the Robot Mower Thoroughly

Before storing, give your robot mower a deep clean. Grass clippings, mud, and sap can attract pests or cause corrosion over the winter. Use a soft brush or compressed air to remove debris from the wheels, blade disc, and undercarriage. Avoid using a pressure washer, as water can force its way into sealed electronics.

Pay special attention to the charging contacts and the perimeter wire connections. Wipe them dry with a cloth. A clean mower is less likely to develop rust or mold during months of inactivity.

Step 2: Remove and Store the Battery Properly

The battery is the most sensitive component in cold weather. Lithium-ion batteries lose capacity permanently if stored below freezing while fully charged or completely empty. Remove the battery from the robot mower and store it indoors at a temperature between 50°F and 70°F (10°C to 21°C). Charge it to about 50% to 70% capacity before storage.

Check the battery every few months during winter and top it up if the charge drops below 30%. Some robot mower models allow you to store the battery separately while leaving the mower in the charging station; consult your manual for the best approach.

Step 3: Choose the Right Storage Location for the Mower

Your robot mower should be stored in a dry, frost-free place. An unheated garage or shed can still get below freezing, which may damage the mower’s plastic housing and electronics. Ideally, store it in a basement, heated garage, or utility room. If you must use an unheated space, cover the mower with a breathable cloth to protect it from dust and moisture.

Do not leave the robot mower outside under a tarp. Condensation can form and cause rust or electrical shorts. A stable indoor environment is best for long-term storage.

Step 4: Service the Blades and Undercarriage

Sharp blades cut cleanly; dull blades tear grass and stress the mower. Before winter storage, inspect the blades for nicks or wear. Clean them with a dry cloth and apply a light coating of oil to prevent rust. If the blades are removable, consider taking them off and storing them separately in a dry place.

Also check the undercarriage for any buildup of dried grass or debris. A clean undercarriage reduces the chance of mold and makes spring startup easier.

Step 5: Update Software and Perform a System Check

Many robot mowers receive firmware updates that improve performance or fix bugs. Before storing, connect your mower to its app and install any pending updates. This ensures you start next season with the latest features. Also check that the charging station and perimeter wires are in good condition; store the charging station indoors if possible.

If your robot mower has a GPS or cellular module, check the manufacturer’s recommendations for winter storage. Some units require you to disable connectivity to save battery.

How to Prepare Your Robot Mower for Winter: A Quick Action List

  • Clean the robot mower thoroughly, including blades, wheels, and charging contacts.
  • Remove the battery and store it indoors at 50% to 70% charge.
  • Store the mower in a dry, frost-free location (basement or heated garage).
  • Inspect and oil the blades; store them separately if possible.
  • Update firmware and check the charging station and perimeter wires.

Following these steps will keep your robot mower in top shape through winter. If you are still deciding which robot mower to buy, understanding lawn size requirements is a great next step. Check out our guide on how many acres a robot mower can mow to see if a robot mower fits your property.

Frequently Asked Questions

Should I leave my robot mower on the charger all winter?

No. Leaving a lithium-ion battery on a constant charger for months can degrade its lifespan. Remove the battery and store it at a partial charge (50% to 70%) in a cool, dry place. Some mowers have a storage mode in their app; use that if available.

Can I store my robot mower in an unheated garage?

Only if the garage stays above freezing all winter. If temperatures drop below 32°F (0°C), the mower’s plastic parts and battery can be damaged. A heated basement or indoor closet is safer. If no heated space is available, remove the battery and store the mower covered with a breathable cloth.

Do I need to remove the blades for winter storage?

It is not required, but it is a good practice. Removing the blades allows you to clean and oil them separately, preventing rust. It also reduces the risk of accidental injury when handling the mower during storage. Store the blades in a dry place.

What should I do with the perimeter wire in winter?

Leave the perimeter wire in place if it is buried or stapled down. If it is above ground, consider securing it to prevent damage from frost heave or snow removal. Check for breaks before spring. You can also disconnect the charging station and store it indoors.

How often should I check the battery during winter?

Check the battery every two to three months. If the charge drops below 30%, charge it back to 50% to 70%. This prevents deep discharge, which can permanently damage lithium-ion cells. Set a reminder on your phone so you don’t forget.

Storing your robot mower properly for winter is straightforward: clean it, remove the battery, and keep it in a dry, frost-free place. For more information on choosing the right robot mower for your lawn, read our article on what size robot mower you need.