How to Store Your Lawn Equipment for Winter (So It Starts in Spring)
Most spring mower problems aren't really spring problems. The carburetor that won't prime, the battery with half the runtime it used to have, the deck that's rusted through along one edge — all of that got decided back in October or November, by what did or didn't happen before the equipment went into the shed. This is the checklist for getting it right the first time, tool by tool.
Lawn Mower
Fuel first — it matters more than anything else on this list. Ethanol-blended gas left sitting in a carburetor over winter absorbs moisture and gums up the small jets that control fuel flow. That gummed-up carburetor is the single most common reason a mower refuses to start in spring. Handle it one of two ways: drain the tank completely, or add a fuel stabilizer and run the engine for several minutes so the treated fuel actually circulates through the carburetor rather than just sitting in the tank.
Change the oil now, not in spring. Oil that's already done a season of work carries combustion acids and fine contaminants that keep attacking engine internals for as long as they're sitting in there — and four or five months of winter storage is a long time for dirty oil to sit against bearings and cylinder walls. Fresh oil before storage means clean oil the whole time the mower is idle.
Pull the blade, sharpen it, reinstall it. Doing this in fall instead of spring means the mower is actually ready to go at the first warm week, instead of sitting in the garage for another week while you get around to sharpening.
Scrape the deck clean. Dried grass and soil clinging to the underside hold moisture against the metal all winter — that trapped moisture is what turns a healthy deck into a rusted-through one over a few seasons. A few minutes with a scraper now prevents that.
Consider fogging the cylinder. Spraying fogging oil into the cylinder through the spark plug hole and pulling the cord a few times coats the internal surfaces and prevents rust from forming inside the engine over winter. It's an optional step, but a cheap one relative to what it protects against.
Battery mowers: pull the battery, store it indoors at 40–60% charge. Lithium-ion batteries lose capacity faster in cold temperatures, and a battery left in an unheated shed all winter — whether fully charged or fully drained — degrades more than one stored at a partial charge in a temperature-stable space.
String Trimmer
Gas trimmers need the same fuel treatment as the mower, arguably more urgently — the carburetor in a typical two-stroke trimmer engine is smaller and even more sensitive to ethanol residue than a mower's four-stroke setup.
Pull the remaining line off the spool and bag it. Trimmer line left wound on the spool over winter dries out and turns brittle, which means it snaps constantly through the first few uses next season instead of feeding smoothly. A sealed bag keeps it flexible.
Clean the head mechanism of accumulated grass and debris before putting it away, for the same reason you clean the mower deck.
Battery trimmers: same rule as the mower — battery out, stored indoors at a partial charge.
Spreader (Broadcast and Drop)
Fertilizer and ice-melt residue left in a spreader over winter is corrosive, and it will pit the hopper, axle, and spreading mechanism if it sits there untouched. Rinse the spreader thoroughly after its last use of the season, let it dry completely before storing — moisture sealed inside a closed hopper is worse than no cleaning at all — and apply a light coat of a rust-preventing spray like WD-40 to the metal parts. Store it with the hopper open or inverted so condensation doesn't pool inside over winter.
Sprayer (Pump and Hose-End)
Residual herbicide or fertilizer concentrate left in a tank or line degrades rubber seals and corrodes metal fittings over months of storage, so flush with clean water after the last application of the season.
Pump sprayers: release all pressure, rinse the tank and hose, and leave the lid off so the interior dries completely before storage — closing a damp tank up for winter just creates a mildew problem. Store with the pump mechanism unlocked to keep ongoing pressure off the seals.
Hose-end sprayers: detach from the hose, rinse the siphon tube and jar, and let everything dry before putting it away.
Hand Tools
Edger blades, aerator shoes, dethatching rakes, and similar hand tools all follow the same three steps: clean off dried soil and grass (trapped moisture against metal accelerates rust the same way it does on a mower deck), sharpen any cutting edges so they're ready to go in spring, and apply a light coat of linseed oil or a rust-preventing spray to metal surfaces. Wipe wooden handles down with linseed oil too — bare wood left untreated through a damp winter is prone to cracking.
Where You Store Everything Matters as Much as How
Dry beats cold. A damp shed does more cumulative damage through rust than a cold but genuinely dry garage does through temperature alone. If you're choosing between a colder dry space and a warmer humid one, take the dry space every time.
Keep equipment off concrete where you can. Concrete wicks moisture up from the slab, which sits against whatever's resting directly on it. Wall hooks or a shelf keep mowers, trimmers, and hand tools off the floor and away from that moisture.
Keep gas equipment away from ignition sources. Store gas-powered tools away from water heaters, furnaces, or anything with a pilot light or open flame — fuel vapors are heavier than air and settle at floor level, which is exactly where most of those appliances sit.
Frequently Asked Questions
Do I need to drain the gas out of my mower before winter?
You need to do one of two things: drain the tank completely, or add fuel stabilizer and run the engine for several minutes so the treated fuel circulates through the carburetor. Leaving untreated, ethanol-blended fuel sitting in the carburetor over winter is the single most common reason a mower won't start in spring — the ethanol absorbs moisture and gums up the jets.
Should I change the oil before or after winter storage?
Before. Used oil contains combustion acids and contaminants that keep attacking engine internals the whole time the mower sits idle. Changing it right before storage means clean oil is sitting in the engine for the next four to five months instead of dirty oil.
Do battery-powered mowers and trimmers need special winter storage?
Yes — remove the battery and store it indoors at roughly 40–60% charge rather than fully charged or fully dead. Lithium-ion batteries lose capacity faster in cold temperatures, and a battery left in an unheated garage or shed all winter will have noticeably less life than one stored at room temperature.
Is it bad to store a mower in a cold garage?
Cold itself is not the main problem — moisture is. A damp shed does more long-term damage through rust than a cold but dry garage does through temperature alone. If you have to choose between a colder dry space and a warmer damp one, take the dry space.
What happens if I skip cleaning the mower deck before storing it?
Dried grass and soil trapped under the deck hold moisture against the metal all winter, which accelerates rust from the inside out — the kind of corrosion you don't notice until the deck is visibly eaten through. Scraping it clean takes a few minutes and prevents a repair that costs a lot more than that.
Can I just leave fertilizer residue in my spreader until spring?
No — fertilizer salts are corrosive, and residue left in a hopper over winter will pit and corrode the metal axle and spreading mechanism. Rinse the spreader thoroughly after its last use, let it dry completely, and apply a light coat of a rust-preventing spray to the metal parts before putting it away.
None of this takes long — most of it is rinse, dry, and a few minutes with a wrench or a sharpening stone. The payoff is a mower that starts on the first pull next April instead of a trip to the small-engine shop during the one week you actually need it.
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