Robot Mower Winter Storage and Off-Season Care Guide Your robot mower has worked faithfully all season, navigating every inch of your lawn with precision. As temperatures drop and grass stops growing, proper robot mower winter storage is what separates owners who start spring fresh from those who troubleshoot dead batteries and corroded charging contacts in April. This guide covers everything you need to do before putting your robot mower away for the off-season. When to Winterize Your Robot Mower Most robot mowers should be stored when: Grass growth slows to below 1 inch per week Nighttime temperatures consistently drop below 40°F (4°C) First frost is within 1–2 weeks for your area Leaves are covering the lawn (some mowers handle leaves; most don't) For most of the United States, this means storing the mower between October and November, with spring restart in March–April depending on your climate zone. Step 1: Final Cleaning The last run before winter storage should be followed immediately by a thorough cleaning. Grass clippings, moisture, and soil that sit on the mower all winter can cause corrosion, clog sensors, and degrade plastic components. Cleaning Process Disable the mower via the app or control panel before any maintenance—never reach under a running mower Rinse the undercarriage with low-pressure water (not a pressure washer—high pressure can force water into electronics) Brush the cutting deck with a stiff brush to remove compacted clippings, especially from wheel wells and sensor areas Clean the charging contacts on both the mower and base station with a dry cloth; if there's visible oxidation, gently clean with a small amount of contact cleaner on a cotton swab Wipe down sensors (bump sensors, lift sensors, rain sensors) with a damp cloth Dry thoroughly before storage—residual moisture causes corrosion Step 2: Blade Inspection and Replacement Winter is the ideal time to evaluate and replace blades so you start spring with a fresh cutting edge. Dull or damaged blades cut grass poorly and put extra load on the motor. Inspect Blades For Chips, cracks, or missing sections (replace immediately—damaged blades are a safety hazard) Worn cutting edges (blades that are thinned out instead of sharp) Loose or missing blade screws Signs of blade disc wear or damage Blade Replacement Rule of Thumb Most robot mower blades last 1–3 months of normal use. If your mower runs daily from April through October (roughly 210 mowing sessions), you've likely gone through 2–3 sets of blades. Replacing blades at the start of winter ensures they'll be ready for spring without delay. Replacement blades for popular models like Husqvarna Automower ( Husqvarna Automower blades ) and Worx Landroid ( Worx Landroid blades ) are widely available and inexpensive—typically $8–20 for a set. Step 3: Battery Care (Most Important Step) The battery is the most expensive component in a robot mower and the one most damaged by improper winter storage. Lithium-ion batteries degrade significantly faster when stored fully depleted or fully charged. The ideal storage charge level is 50–80%. Winter Battery Protocol Check charge level via the app or display before storage—you want 50–80% charge If too high (above 80%: Run the mower for one additional session to bring the charge down, then clean and store If too low (below 40%): Charge to 50–60% before storage—never store a fully depleted battery Store at room temperature: Never leave the battery in an uninsulated garage or shed where temperatures drop below 32°F (0°C) for extended periods. Freezing damages lithium-ion cells permanently. Check charge every 1–2 months: Lithium batteries self-discharge slowly (2–3% per month). Top up to 50–60% if the charge drops below 30% during storage Should You Remove the Battery for Winter? For most modern robot mowers (Husqvarna, Worx, EGO, Greenworks), storing the whole unit indoors in a temperature-controlled space is sufficient. Removing the battery is only necessary if the mower must be stored in an unheated space—in that case, keep the battery inside at room temperature. Step 4: Check and Protect the Perimeter Wire The boundary wire is what keeps your robot mower in its designated zone. Winter is a good time to inspect and repair any damage before the new season. Perimeter Wire Inspection Walk the entire boundary wire perimeter looking for visible damage—cuts, exposed copper, crushed sections under garden edging Check connection points at the charging station for corrosion or loose connections Test signal strength in your mower's diagnostic menu if available Common Wire Damage Sources Lawn edgers or string trimmers cutting across buried wire Aerating tools, spike shoes, or garden fork work Animals (dogs, rodents) chewing exposed wire Frost heave in regions with freeze-thaw cycles Repair wire breaks with waterproof wire connectors specifically designed for robot mower boundary wire—never use standard electrical tape, which fails underground in wet conditions. Step 5: Charging Station Maintenance Clean the charging contacts on the station with a dry cloth Check that the station's guide wires (if your model uses them) are properly tensioned For outdoor charging stations: cover with a weather-protective cover or store the station indoors For integrated outdoor stations (Husqvarna's garage, etc.): ensure drainage holes are clear of debris Disconnect power to the charging station if storing indoors for the winter Step 6: Software and Firmware Updates Winter downtime is the perfect time to run firmware updates. Updates often improve obstacle detection, navigation algorithms, and connectivity—so you start spring with the best-performing software version. Open your mower's app and check for available updates Run any pending firmware updates while the mower is connected to WiFi and plugged in to charge Review your mowing schedule settings to confirm they're still appropriate for spring Storage Conditions Checklist ☑️ Temperature: 32°F–77°F (0°C–25°C) — avoid freezing or extreme heat ☑️ Humidity: Low to moderate — excessive moisture causes corrosion ☑️ Location: Garage shelf, storage room, or basement — off concrete floors to improve airflow ☑️ Battery charge: 50–80% ☑️ Mower is clean and dry ☑️ Blades inspected and replaced if needed ☑️ Charging contacts clean Spring Startup Checklist When spring arrives and grass starts growing again: Install fresh blades if you didn't replace them in fall Check tire inflation (wheels on some models are inflatable) Reconnect the charging station and power it on Walk the perimeter wire to check for any winter damage Update the mowing schedule for the new season Run a calibration/mapping session if your mower requires it after a long shutdown Start with shorter mowing sessions for the first 1–2 weeks to let the battery reconditioning cycle run Looking for a new robot mower for next season? Browse our reviews and comparisons to find the best model for your yard size and budget. Proper winter care extends the life of any robot mower and ensures you're ready for a full season of effortless lawn maintenance. Frequently Asked Questions Can I leave my robot mower outside in winter? It depends on the model and your climate. Some robot mowers (particularly Husqvarna's top models) are designed for year-round outdoor use and can handle light freezing. However, storing any robot mower in conditions below 32°F for extended periods damages the lithium-ion battery and can degrade plastic components. If in doubt, store indoors. What charge level should I store my robot mower battery at? Store at 50–80% charge. Storing fully depleted causes lithium-ion cell damage over time, while storing fully charged for months accelerates degradation. Check the charge every 1–2 months during storage and top up to 50–60% if it drops below 30%. Should I remove the robot mower battery for winter storage? Only if you can't store the mower itself in a temperature-controlled space above freezing. If your garage or shed drops below 32°F in winter, remove the battery and store it indoors. The mower body can tolerate temperature extremes better than the battery can. How do I know if my robot mower's perimeter wire is damaged? Your mower will typically show a "boundary wire error" or "loop signal error" on the display or in the app if the wire is cut or has a break. You can also use your mower's diagnostic mode to check signal strength at various points. Walk the wire perimeter visually to spot obvious cuts or damage. How often should I replace robot mower blades? Most manufacturers recommend replacing blades every 1–3 months during the mowing season, or every 50–60 hours of operation. Check blades monthly during peak season—small stones and debris dull blades quickly. Replace immediately if you see chips, cracks, or thinning cutting edges.