How to Winterize Your Lawn Mower for Storage
A lawn mower works hard through spring and summer, collecting grass clippings, dust, moisture, and fuel residue. Putting it away without preparation can lead to a hard start, a clogged carburetor, a corroded blade, or a dead battery when mowing season returns.
Learning how to winterize your lawn mower for storage takes little time and helps protect the engine, deck, wheels, and electrical components. The right process depends on whether you use a gas-powered, battery-powered, or corded electric mower, but every model benefits from cleaning and dry, secure storage.
Choose a mild, dry day for the work. Gather gloves, a stiff brush, a drain pan, fresh engine oil if required, fuel stabilizer, a spark plug wrench, and the owner’s manual. Always disconnect the spark plug wire before working beneath a gas mower and remove the battery from an electric model.
Clean The Mower Before Storage
Begin by removing grass clippings and soil from the mower deck, wheels, discharge chute, and underside. For a gas mower, turn off the fuel supply if the model has a shutoff valve, disconnect the spark plug wire, and tip the machine only as directed in the manual. Many push mowers can be tilted with the air filter and carburetor side kept upward to prevent oil or fuel from entering the wrong areas.
Use a plastic scraper or stiff nylon brush rather than a sharp metal tool that could damage painted surfaces. Avoid spraying water directly onto the engine, air filter, battery compartment, control panel, or electrical connections. If you do rinse the deck, dry it completely before storage and inspect it for chipped paint or exposed metal.
A clean machine also makes pest activity easier to notice. If the mower is stored near the house, remove nearby grass piles and check the surrounding lawn for insect problems; guidance on natural grub treatment can help reduce one source of lawn damage and wildlife digging.
Prepare Fuel And Engine Oil
Old gasoline is one of the most common reasons a mower refuses to start after winter. Gasoline can lose volatility and leave varnish in the carburetor, fuel lines, and tank. Follow the manufacturer’s instructions for either draining the tank and carburetor or adding the correct amount of fuel stabilizer to fresh fuel.
If you use stabilizer, run the engine for several minutes so treated fuel reaches the carburetor. Do not store fuel in an open container, and never drain gasoline near a flame, furnace, drain, or other ignition source. A fuel can should be approved for gasoline and kept in a cool, ventilated location away from living areas.
Check the engine oil while the mower is level. If the oil looks dark, gritty, or overdue according to the service schedule, change it before storage. Warm oil drains more easily, but let the engine cool enough to handle safely. Refill to the level specified in the manual, since too much or too little oil can cause engine trouble.
Inspect Blades, Filters, And Spark Plug
Remove the blade for inspection if the manual permits it. Look for bends, deep nicks, cracks, or excessive wear, and replace a damaged blade rather than trying to straighten it. A dull blade tears grass and places extra strain on the engine. If sharpening is appropriate, secure the blade firmly and maintain its original balance.
Check the air filter and replace a disposable filter that is dirty or saturated with oil. Foam filters can often be washed, dried fully, and lightly oiled according to the manufacturer’s instructions. A restricted filter makes starting difficult and reduces engine performance.
Remove and inspect the spark plug. Replace it if the electrode is worn, the porcelain is cracked, or deposits cannot be cleaned safely. If the plug is serviceable, check the gap against the manual and reinstall it carefully. Keep the plug wire disconnected until all work beneath the mower is complete.
| Mower component | Storage task | Reason |
|---|---|---|
| Fuel system | Stabilize or drain fuel as directed | Prevents stale fuel and carburetor deposits |
| Engine oil | Change overdue or contaminated oil | Reduces corrosion and deposits |
| Blade and deck | Clean, inspect, and protect exposed metal | Limits rust and improves spring performance |
| Air filter | Clean or replace the filter | Supports proper airflow and starting |
| Battery | Remove, clean, and charge as specified | Helps prevent discharge and terminal corrosion |
| Tires and wheels | Remove debris and check pressure | Reduces flat spots and rolling problems |
Protect Battery And Electrical Parts
Battery-powered mowers require a different storage routine. Remove the battery before cleaning or servicing, then wipe dirt from the contacts and inspect the pack for cracks, swelling, leaks, or unusual heat damage. A damaged lithium-ion battery should not be used or stored indoors; follow local hazardous-waste guidance and the manufacturer’s safety instructions.
Store a healthy battery in a cool, dry place away from direct sunlight and freezing conditions. The correct charge level varies by manufacturer, so use the manual rather than assuming it should remain fully charged. Some batteries should be stored partially charged, while others may require periodic charging during the off-season.
For a corded electric mower, inspect the power cord, plug, strain relief, and extension cord for cuts or exposed wiring. Coil cords loosely without sharp bends, and keep all electrical equipment dry. Do not leave the mower plugged in while it is stored.
Choose A Dry Storage Location
A shed, garage, or other covered area protects the mower from rain, snow, and ultraviolet light. Set it on a level surface, away from water heaters, furnaces, pilot lights, and household chemicals. Gas-powered equipment should have adequate ventilation, and fuel should never be stored in a basement or near an occupied sleeping area.
Before covering the mower, make sure the engine, deck, and wheels are completely dry. Use a breathable equipment cover instead of plastic sheeting that traps condensation. Avoid sealing a damp mower inside a tight container, because trapped moisture can accelerate rust on the blade, fasteners, and deck.
Rodents may nest in sheds and garages, especially when the equipment remains undisturbed for months. Keep birdseed, pet food, and grass seed in sealed containers, and inspect the mower periodically for nesting material or chewed wiring. Do not place loose mothballs or toxic substances near children or pets.
Complete A Seasonal Storage Checklist
A short final inspection helps prevent small oversights. Confirm that the fuel decision, oil service, blade inspection, and battery storage have all been handled. Record any parts that need replacement so the mower can be serviced before the first busy mowing week.
- Brush away clippings and remove packed debris from the deck
- Stabilize or drain gasoline according to the mower manual
- Change engine oil and inspect the air filter
- Check the blade, spark plug, tires, cables, and fasteners
- Store batteries separately and cover the dry mower with breathable material
If the mower has a self-propelled drive, inspect the belt and drive cable for wear without spraying lubricant where the manual does not recommend it. Fold the handle only if the design allows it, and avoid placing heavy items on top of the machine. Keep the owner’s manual and replacement parts information nearby for easy spring maintenance.
A clean storage area supports the rest of your home upkeep routine. When outdoor maintenance involves dirty masonry or tracked-in soil, these instructions for clean exterior brick can help you avoid damaging brick surfaces with excessive pressure or harsh cleaning products.
Before storing the mower, run through the checklist once and correct any problem you find rather than postponing it until spring. Proper fuel care, dry storage, and routine inspection will make the next start safer and more reliable while extending the useful life of the equipment.