How to Winterize Your Lawn Mower in Five Easy Steps
Cold weather, wet grass, and long periods without use can be hard on a lawn mower. Fuel can degrade, batteries can lose charge, and moisture can cause rust in places that are easy to overlook. A few hours of preparation at the end of the mowing season can prevent difficult starting and expensive repairs when spring arrives.
Winter storage looks slightly different for a gas push mower, a self-propelled model, a riding mower, or a battery-powered machine. The basic goals remain the same: remove contamination, protect moving parts, store the equipment safely, and make it ready for its next use.
Before beginning, park the mower on a level surface, switch it off, disconnect the spark plug wire on gas models, and allow hot components to cool. Wear gloves when handling blades or fuel, and work in a well-ventilated area away from flames, heaters, and sparks.
Gather Supplies And Choose A Storage Location
Start by collecting the supplies needed for the job. A fuel-approved container, siphon pump, fresh engine oil, an oil drain pan, a socket or wrench set, a wire brush, a stiff nylon brush, rags, lubricating spray, and a battery charger will cover most seasonal maintenance tasks. Consult the owner’s manual before using any fluid or removing a component.
Choose a storage location that is dry, sheltered, and protected from freezing rain. A garage or shed is preferable to an uncovered area, but the mower should still be kept away from furnaces, water heaters, and other ignition sources. Never store gasoline in an unapproved container or leave a fuel can beside the mower.
Clear enough space to work around the machine safely. Riding mowers need additional room for lifting the hood, accessing the battery, and removing the deck if necessary. If the mower must be transported or stored off-site, photograph cable connections and hardware before disassembly so reassembly is straightforward.
Stabilize Or Remove The Fuel
Gasoline is one of the most important parts of seasonal mower storage. Fuel left in a carburetor or tank can evaporate and leave sticky deposits that restrict fuel flow. Ethanol-blended gasoline can also attract moisture, which may contribute to corrosion and rough running. For additional storage advice, see this fresh fuel guidance.
For a mower that will sit unused for several months, the safest approach is often to drain the fuel tank and run the engine outdoors until it stops from lack of fuel. Do not drain gasoline onto the ground or into a household drain. Collect it in an approved container and take it to a local hazardous-waste or fuel-recycling facility.
Some manufacturers recommend adding fuel stabilizer instead of draining the tank. If you use stabilizer, add the correct amount to fresh gasoline, run the engine for several minutes, and allow treated fuel to reach the carburetor. Stabilizer cannot restore badly degraded gasoline, so it should be mixed with clean fuel before storage.
Battery mowers do not need fuel treatment, but their batteries still need attention. Remove a detachable battery, clean its terminals if needed, and store it in a cool, dry place according to the manufacturer’s temperature guidance. Do not leave a lithium-ion battery in an unheated shed if the manual warns against freezing conditions.
| Mower type | Main winterizing task | Storage priority | Spring-start preparation |
|---|---|---|---|
| Gas push mower | Drain fuel or use stabilizer; change oil | Dry, ventilated storage | Reconnect plug wire and check oil |
| Self-propelled gas mower | Service fuel, oil, belt, and drive system | Keep transmission and cables dry | Inspect drive engagement |
| Riding mower | Service fuel, oil, deck, battery, and tires | Protect from moisture and rodents | Charge battery and test controls |
| Corded electric mower | Clean deck and inspect cord | Keep indoors and away from dampness | Check cord and safety switch |
| Battery mower | Remove and correctly store battery | Avoid extreme heat and cold | Fully charge when appropriate |
Change Oil And Protect The Engine
Used engine oil contains contaminants that can remain in contact with internal components during storage. Changing it before winter removes those contaminants and gives the engine clean lubrication when it is started again. Run a gas mower for a few minutes first if the manufacturer permits, because warm oil drains more completely.
Place a drain pan beneath the mower, remove the drain plug or use an approved extraction method, and dispose of the old oil at a participating recycling location. Refill with the grade and quantity listed in the owner’s manual. Overfilling can be as harmful as running with too little oil, so check the dipstick on level ground.
Replace the air filter if it is dirty, damaged, or saturated with oil. A foam filter may be washable if the manual allows cleaning, while paper filters generally need replacement. Check the spark plug as well. If its electrode is heavily worn or coated with deposits, install the recommended replacement and set the gap correctly.
For riding mowers, inspect the oil filter and replace it when required. Also examine fuel lines, wiring, and the area around the engine for leaks or rodent damage. Do not spray water directly onto the engine, electrical connections, or control panel while cleaning.
Clean The Deck And Inspect The Cutting System
Grass clippings hold moisture against the mower deck, creating an ideal environment for rust. Tip a walk-behind mower only in the direction specified by its manufacturer, usually with the air-filter and carburetor side facing upward. Disconnect the spark plug wire before reaching beneath the deck, and use a block or suitable support rather than relying on the handle.
Scrape away packed clippings with a plastic or wooden tool. A brush can remove dry residue from corners and discharge chutes. After cleaning, let the underside dry fully. A light coat of manufacturer-approved corrosion protectant can help shield bare metal, but keep sprays away from belts, brake components, and friction surfaces.
Inspect the blade for bends, cracks, deep nicks, and excessive wear. A dull blade produces ragged cuts and increases engine strain, while a damaged blade presents a serious safety risk. Sharpen or replace it according to the mower’s instructions, and make sure it is balanced before installation.
Riding mower owners should inspect the deck belt, pulleys, spindles, and discharge chute. Remove debris from around the deck and check that guards are secure. If the mower is being prepared for long-distance relocation rather than ordinary winter storage, a detailed shipping breakdown guide can help clarify which parts require special handling.
Lubricate Moving Parts And Store It Securely
Lubricate pivot points, control cables, wheel bearings, and other locations identified in the owner’s manual. Use the correct grease or oil rather than applying a general-purpose product everywhere. Excess lubricant attracts dust and can reach belts or pulleys, so wipe away drips after application.
Check the tires on a riding mower and inflate them to the recommended pressure. Walk-behind mower wheels should turn freely without excessive wobble. Engage and release the parking brake on a riding mower, then confirm that the steering and control levers move normally before placing the machine in storage.
Remove the battery from a riding mower if the manual recommends it. Clean corrosion from the terminals, charge the battery with a suitable charger, and keep it on a maintenance charger only if that charger is approved for the battery. Store the battery upright in a dry area and keep terminals from contacting metal objects.
Position the mower so it cannot roll, tip, or block an exit. Use a breathable cover rather than sealing a damp machine beneath plastic, which can trap condensation. Keep the equipment away from children and pets, and consider using rodent deterrents near—but never inside—the air intake, exhaust, or engine compartment.
Set A Simple Seasonal Maintenance Routine
Winterizing works best when it becomes part of a repeatable end-of-season routine. Write down the date of the oil change, blade service, battery charge, and fuel treatment. This record makes it easier to identify overdue maintenance and order filters, plugs, belts, or blades before the next mowing season begins.
A short inspection every few weeks is useful if the mower is stored in a damp shed or an area with rodents. Look for fresh leaks, chewed wiring, rust, flat tires, and signs that insects or animals have entered the air filter housing. Avoid starting a gas mower indoors, even briefly, because carbon monoxide can build up quickly.
Use these practical checks when preparing different mower types:
- Drain gasoline when the machine will remain unused for an extended period, unless the manufacturer specifies another method.
- Keep batteries in a temperature-controlled, dry location and follow the charging instructions for the exact battery chemistry.
- Clean grass and soil from the deck before applying any protective product.
- Replace damaged blades, belts, fuel lines, filters, or electrical cables before spring operation.
- Store manuals, spare keys, charger cables, and removed hardware together in a labeled container.
When warm weather returns, inspect the mower before adding fuel or reconnecting the battery. Check fluid levels, tire pressure, blade attachment, safety switches, and controls. Start gas equipment outdoors and allow it to idle briefly while checking for leaks or unusual noises. A careful restart confirms that the winter storage process protected the machine.
Set aside time at the end of your final mowing session to complete these five steps: prepare the workspace, manage fuel or the battery, change engine fluids, clean and inspect the cutting system, then lubricate and store the mower securely. Use the owner’s manual for model-specific requirements, and keep a maintenance record so the next season begins with a dependable machine rather than an avoidable repair.