Can Electric Lawn Mowers Be Stored Outside? Full Guide

Quick Answer / TL;DR: Electric lawn mowers can be stored outside for short periods (1–3 days) if covered with a waterproof mower cover and kept off damp ground. Long-term or winter storage outdoors is not recommended — moisture, freezing temperatures, and UV exposure damage lithium-ion batteries, corrode electronics, and can void your warranty. Indoors is always best.

Need related maintenance info? Our guide on do electric lawn mowers have air filters walks through the details, and our Husqvarna lawn tractor electric starter review covers the main options at a glance.

What You Need

Before storing your electric mower outside, gather these items. As a garden equipment technician, I can tell you that most “my mower died over winter” calls come down to skipping one of these basics.

Preparation: Choose your storage location before buying anything. Indoor options (garage, shed, basement) always beat outdoor storage. If you must go outdoors, pick a spot shielded from prevailing wind and rain, away from sprinklers, and out of direct afternoon sun. Many homeowners ask whether lawn mowers need to be stored in an enclosed area — while it’s the gold standard, it’s not always possible. Understanding your options upfront helps you make the best call.

Step-by-Step Guide: Storing Your Electric Mower Outside Safely

Step 1: Assess Your Storage Options Before Choosing Outdoors

The right decision depends on your space, climate, and how long you’ll be storing the mower. Use this rule of thumb:

• 1–3 days: Outdoor storage is fine with a quality cover and a dry, elevated surface.
• 1–4 weeks: Outdoor storage works only with a cover, ventilation, moisture absorbers, and battery removed indoors.
• Winter / off-season: Outdoor storage is not recommended without an enclosed shed or shelter. Store the battery indoors regardless.

Unlike gas mowers, electric models contain sensitive electronics, sealed motors, and lithium-ion battery packs — all vulnerable to moisture, temperature swings, and UV exposure. A poorly stored mower can fail within one to two seasons, and outdoor water damage typically voids the manufacturer’s warranty.

Step 2: Clean and Dry the Mower Completely

Remove the battery first, then brush off clippings and caked grass from the deck, wheels, and underside. Rinse lightly with a garden hose — never a pressure washer — and wipe down the housing. Blow out vents and the battery compartment with compressed air or a dry cloth.

💡 Pro Tip: Grass left on the deck holds moisture against the metal all winter. This is the #1 cause of deck rust I see on mowers brought in for spring service. Ten minutes of cleaning now saves a corroded deck later.

⚠️ Warning: Never spray water directly into motor vents, battery ports, or the control panel. Water intrusion here causes corrosion and can void your warranty entirely.

Step 3: Charge the Battery to ~50–60% and Store It Indoors

Lithium-ion batteries — used in most modern cordless mowers — degrade significantly when stored below 32°F (0°C) or above 104°F (40°C). Charge or discharge to roughly half capacity, then bring the battery inside to a climate-controlled space such as a closet or basement shelf.

💡 Pro Tip: If you’re storing for the off-season, top the battery back up to 50–60% every 2–3 months. Batteries stored fully dead may never recharge.

⚠️ Warning: Never leave a lithium-ion battery on a concrete floor, in a freezing shed, or in a hot car. Cold permanently reduces capacity; extreme heat creates a fire risk.

Step 4: Elevate the Mower Off the Ground

Place the mower on a wooden pallet, pavers, or a rubber mat so it never sits directly on soil, grass, or concrete that traps moisture. In a pinch, wall-mounted rubber-coated hooks let you hang many models vertically — check your manual first, as some manufacturers advise storing specific models only on their wheels.

Step 5: Cover and Secure

Fit a breathable waterproof mower cover over the unit. Add 2–3 silica gel packs inside the cover to absorb trapped humidity. Secure the cover with bungee cords or tie-downs so wind can’t peel it back — an uncovered corner on a rainy night undoes all your preparation.

💡 Pro Tip: A waterproof cover combined with an elevated, ventilated surface reduces outdoor storage risk by up to 80% compared to leaving the mower uncovered. Avoid tarps pressed tight against the deck — they trap condensation, which is worse than no cover at all.

Step 6: Check On It Regularly

Inspect the mower every 1–2 weeks. Look for pooled water, a shifted cover, condensation under the cover, rust spots, or rodent nests. Replace damp silica packs and re-secure tie-downs as needed. Catching a small problem early is the difference between a wipe-down and a repair bill.

Common Mistakes & Troubleshooting

• Mistake 1: Covering a damp mower. Sealing moisture under a cover creates a corrosion chamber. Fix: Always air-dry the mower for several hours — ideally in the sun — before covering it.
• Mistake 2: Leaving the battery on the mower. Cold snaps below 32°F permanently reduce lithium-ion capacity, and contacts corrode in humid conditions. Fix: Remove the battery and store it indoors at ~50–60% charge, every time.
• Mistake 3: Using a non-breathable tarp pulled tight. Tarps trap condensation against the deck and electronics. Fix: Use a purpose-made mower cover with ventilation panels, and leave slight airflow at the bottom.
• Mistake 4: Storing directly on grass or soil. Ground moisture wicks up into the deck and motor housing within days. Fix: Elevate on a pallet, pavers, or rubber mat.
• Mistake 5: Skipping seasonal checks. A cover blown off in a storm means weeks of exposure. Fix: Set a recurring reminder to inspect the cover, tie-downs, and silica packs every 1–2 weeks.

Troubleshooting after outdoor storage: If the mower won’t start in spring, first inspect the battery contacts for white or green corrosion and clean them with a dry cloth and contact cleaner. Check that no water entered the battery compartment — if it did, let the housing dry fully for 48 hours before powering up. If the motor hums but the blade won’t turn, check for grass packed around the blade spindle. Still no power after these checks? The control board or motor may have suffered moisture damage — that’s a technician job, and it likely won’t be covered by warranty if water intrusion is found.

Frequently Asked Questions

Can electric lawn mowers be left outside in the rain?

Only briefly and only if covered. While most electric mowers carry some water resistance, they are not waterproof. Rain penetrating the motor housing or battery compartment causes corrosion, electrical shorts, and warranty denial. A covered, elevated mower can shrug off a shower; an uncovered one sitting in a downpour is being damaged.

Can I store my electric mower outside during winter?

Not recommended. Freezing temperatures degrade lithium-ion batteries even when disconnected, and repeated freeze-thaw cycles crack seals and gaskets. For winter, store the mower in a shed or garage and bring the battery indoors. If a shed is your only option, add insulation, silica packs, and a quality cover, and check it monthly.

What temperature is too cold to store an electric mower battery?

Below 32°F (0°C), lithium-ion cells lose capacity permanently; above 104°F (40°C), they degrade rapidly and become a fire risk. The ideal storage temperature is between 50°F and 77°F (10°C–25°C) in a dry indoor location — which is why the battery should always live inside your home, not outside with the mower.

Will storing my mower outside void the warranty?

It can. Most manufacturer warranties exclude damage from water intrusion, corrosion, and improper storage. If a technician opens your mower and finds rust or moisture damage consistent with outdoor exposure, the claim is typically denied. Following the steps above — dry, covered, elevated, battery indoors — protects both the machine and your warranty.

How long can an electric mower safely stay outside?

One to three days covered is generally safe. Up to a few weeks is workable with a cover, elevation, moisture absorbers, and the battery stored indoors. Anything longer — especially through a full season — requires an enclosed shed or shelter, and even then, expect a shorter lifespan than indoor storage.

Is a storage shed enough, or do I need a garage?

A shed is a huge upgrade over open-air storage and is sufficient for most climates — provided it’s dry, ventilated, and the battery still comes indoors. Garages and basements offer the best temperature stability. If neither is available, a plastic storage enclosure ($150–$500) on a paved surface is the next best option for your mower’s lifespan.