How to Store a Lawn Mower for Winter: Step-by-Step Guide

Every spring, small engine repair shops across the country see the same rush of frustrated homeowners pulling in with mowers that refuse to start after a long winter. Nine times out of ten, the culprit is one of five preventable issues: gummed-up fuel lines, varnished carburetor jets, dead batteries left connected in freezing sheds, rusted decks full of last season’s grass, or engine oil that has turned acidic over the off-season. The good news is that learning how to winterize a lawn mower takes roughly 60 to 90 minutes and a few inexpensive supplies, and the payoff shows up the first warm weekend of mowing season.

Proper winter storage is the single highest-ROI maintenance task most homeowners will ever perform on their mower. Industry data from manufacturers like Briggs & Stratton suggests that consistently winterized equipment lasts an average of two to three years longer than neglected machines, and reduces spring startup problems by roughly 80%. Beyond equipment longevity, a clean, sealed fuel system protects a small engine from costly carburetor rebuilds (typically $75-150), and a removed or maintained battery can save another $50-100 in replacement costs. The investment of an hour in fall pays dividends every spring for the life of the machine.

Timing matters more than most people think. The window for winterization opens after your final cut of the season and closes before sustained freezing temperatures arrive. In USDA zones 3 through 6, that usually falls between mid-October and late November. In zones 7 through 9, you may not need to winterize until December or even January. The work itself breaks down into fuel management, engine service, battery care, blade maintenance, storage prep, and pest deterrence. The sections below walk through each step with the depth needed to handle gas, electric, riding, and robotic mowers alike.

TL;DR – How to Store a Lawn Mower for Winter in 6 Steps: (1) Clean the deck thoroughly and let it dry. (2) Treat the fuel system with ethanol-free gas and stabilizer (1 oz per 2.5 gallons) or fully drain the tank and run the engine dry. (3) Change the oil while the engine is warm. (4) Remove the battery and store it indoors at 50-60% charge, or connect it to a battery tender. (5) Sharpen, balance, and reinstall the blade. (6) Store in a dry, climate-controlled space with rodent deterrence in place.

Pre-Winter Preparation: Essential First Steps

Before touching the fuel system or engine, set yourself up with the right supplies and a clean workspace. For a push mower, gather about a quart of fresh oil (SAE 30 for climates consistently above 40°F, or 5W-30 for variable temperatures), a new spark plug (typically NGK BPR5ES or equivalent, gapped to 0.030 inches), fuel stabilizer, a spark plug wrench, a flat blade screwdriver, a ratchet set with metric and SAE sockets, clean rags, a stiff brush, and a putty knife for deck scraping. Riding mowers add a grease gun, tire pressure gauge, transaxle fluid (per the operator’s manual spec), and possibly a new oil filter and air filter element.

Park the mower on a flat concrete pad or plywood sheet. Pull the spark plug wire off the plug and tape it to the handle so it cannot arc back onto the terminal during the work. For electric start mowers, disconnect the negative battery cable first (always negative before positive) to prevent any chance of a short circuit while you’re working around the engine. Lay out a drip pan under the oil drain area before you warm up the engine for the oil change.

Start with a thorough cleaning because everything that follows is easier on a clean machine. Tip the mower on its side with the carburetor facing up (consult the manual – some four-stroke engines must only be tipped a specific direction to avoid oil flooding the air filter). Scrape compacted grass from the underside of the deck with the putty knife, then hose off the remaining clippings and let the deck air-dry completely. Trapped moisture under grass mats is the single biggest cause of deck rust during winter storage. While the deck dries, walk around the mower and inspect each wheel, cable, and fastener for damage or excessive wear. Catching a worn cable or dry-rotted tire now gives you winter downtime to order parts rather than discovering the problem on the first spring mow.

Fuel System Management: The Most Critical Step

Every spring repair ticket involving “won’t start,” “runs rough,” or “no fuel delivery” traces back to what happened (or didn’t happen) to the fuel system over the winter. Modern pump gasoline contains somewhere between 0% and 10% ethanol in most of the country, and that ethanol is fundamentally incompatible with long-term storage inside a small engine. Ethanol is hygroscopic – it actively pulls water vapor out of the air through every rubber fuel line, gasket, and vented gas cap. Over a four-month winter, a sealed fuel tank can absorb enough water through normal venting to phase-separate, leaving a layer of water-ethanol mix at the bottom of the tank and a layer of straight gasoline on top.

As if moisture wasn’t bad enough, gasoline itself oxidizes over time. The lighter hydrocarbons evaporate first, leaving behind heavier fractions that polymerize into a sticky resin commonly called varnish. Oxidation also produces gum deposits – hard, dark residues that cling to metal surfaces inside the carburetor. The most visible damage shows up at the carburetor jet, a precisely calibrated brass orifice that meters fuel into the air stream. Jets have passages as small as 0.020 inches, and a single season of untreated gas can partially or fully clog them. When jets clog, the engine either won’t start, runs extremely lean (which overheats and damages the piston), or idles roughly and dies under load. Cleaning or replacing a carburetor because of bad fuel is a $75-150 repair that proper winterization prevents entirely.

Choose Your Fuel Strategy: Stabilize vs Drain

Two schools of thought dominate winter fuel storage, and both work when done correctly. The table below summarizes the trade-offs so you can pick the right approach for your situation. The method you choose should depend on storage duration, fuel injection versus carbureted engine, and personal preference.

Factor	Fuel Stabilizer Method	Full Drain Method
Best for storage duration	3 months or less (works up to 12 months)	Any duration, especially over 6 months
Best for engine type	Fuel-injected and EFI engines	Carbureted push mowers and older riding mowers
Effort required	Low – add stabilizer, run engine 10 minutes	Medium – siphon, run dry, dispose of old fuel
Materials needed	Fresh gasoline and quality stabilizer (STA-BIL 360 or Sea Foam)	Siphon pump, approved fuel container, disposal plan
Risk of error	Wrong ratio or skipping the 10-minute run cycle	Leaving fuel in float bowl or lines
Spring startup result	Cranks and runs on first or second pull	Requires fresh gasoline before first start
Cost	About $6-12 per treatment	Free (uses existing fuel)

The Stabilizer Method: Step-by-Step

The most common mistake with stabilizer is adding it to old fuel that’s already been sitting in the tank for a few weeks. Once oxidation has begun, stabilizer cannot reverse it – it can only slow further degradation. Always start with fresh gasoline purchased within the last 30 days. Top off the tank to nearly full (a full tank leaves less air space for moisture to accumulate, which matters as much as the stabilizer itself). Then add the stabilizer at the ratio printed on the bottle. STA-BIL 360, the most widely cited brand, calls for 1 ounce per 2.5 gallons of gasoline. For a typical push mower holding 0.5 to 1 gallon, that’s roughly 0.4 ounces, or about a third of the small bottle’s measuring chamber.

Cap the fuel tank, then run the engine for at least 10 minutes at idle or under light load. This step is non-negotiable because it circulates the treated fuel through the fuel lines, around the float bowl, and out through the carburetor jets. Without this circulation, the fuel in the lines and carburetor remains untreated and will still varnish over winter. When the 10 minutes is up, shut off the engine and reattach the spark plug wire if you removed it earlier. The mower is now ready for storage with the fuel valve (if equipped) turned to the closed position.

The Full Drain Method: Step-by-Step

Run the engine outdoors or with ventilation until the fuel gauge shows nearly empty, then shut it off. Use a hand siphon pump (available at any auto parts store for under $15) to transfer the remaining fuel from the tank into an approved gasoline container. With the fuel line disconnected at the carburetor or the fuel valve opened, gravity will drain whatever the siphon missed. Reconnect everything, then restart the engine. It will sputter for a minute or two on the fuel still in the carburetor bowl, then die on its own as the last fuel burns off. Do not attempt to “help it along” by spraying starting fluid or pouring fuel down the carburetor throat – this can hydrolock the engine and cause piston damage. Once the engine stops and won’t restart after several pulls, the carburetor is fully dry. Cap the now-empty fuel tank and the mower is ready for storage.

Oil Change and Engine Maintenance

Used motor oil picks up combustion byproducts, water vapor, and unburned fuel that all turn acidic over the months of winter storage. Leaving that oil in the crankcase accelerates internal corrosion of bearings, the crankshaft, and the camshaft. A fresh oil change costs about $5 in materials and 15 minutes of work, and it neutralizes this risk entirely. Riding mower engines follow the same procedure as automotive engines. The procedure below works for most small four-stroke engines; always cross-check the torque specs and oil capacity against your operator’s manual.

8-Step Oil Change Procedure

1. Warm the engine. Run the mower for 5 minutes to bring the oil up to operating temperature. Warm oil flows faster, carries more contaminants out with it, and drains more completely than cold oil sitting in a cold engine.
2. Disconnect the spark plug wire. Tape it back to the handle so it cannot spring onto the plug while the engine is tipped or worked around.
3. Position the mower over the drain pan. Place a wide, shallow oil drain pan directly under the drain plug. For push mowers, tip the mower on its side with the air filter and carburetor facing UP (this matters – tipping the wrong way fills the air filter with oil and produces white smoke on the next start).
4. Remove the oil fill cap and drain plug. Removing the fill cap breaks the vacuum and lets the oil flow freely. Place the drain plug in a parts tray so it doesn’t get lost.
5. Let the oil drain completely. Wait at least 5 minutes for the pan to empty. Tilting the mower slightly nose-down extracts the last half ounce from the sump.
6. Replace the oil filter if equipped. Lightly coat the new filter’s rubber gasket with fresh oil before installing (this lubrication is what allows the gasket to seal properly). Hand-tighten the filter until the gasket contacts the mounting surface, then turn an additional 3/4 turn. Over-tightening distorts the gasket and causes leaks.
7. Reinstall the drain plug. Torque the plug to specification – typically 14-18 ft-lbs for most small engines. Snug is not enough – the plug needs to be tight enough to handle vibration without backing out, but not so tight that the threads strip. Replace the sealing washer or crush washer if your engine uses one.
8. Refill with the correct oil grade. Most push mowers hold 18-22 oz; riding mowers hold 48-64 oz. Pour slowly through the fill opening, then wait 60 seconds for the oil to settle into the sump before checking the dipstick. Fill to the upper mark on the dipstick, but do not overfill – overfilled oil foams in the crankcase and reduces lubrication efficiency.

Spark Plug and Air Filter Service

Before reinstalling the spark plug wire, swap in a new spark plug. Even if the old plug looks fine, a fresh plug costs $3-5 and takes 60 seconds to install. Gap the new plug to the specification in your manual – most small engines call for a 0.030 inch gap. Torque the plug to 18-22 ft-lbs (snug plus a quarter turn past finger-tight on most models). While you’re at it, replace the air filter element if it’s paper or pleated, or wash and re-oil the foam pre-cleaner if your model uses one. A clean air filter is doubly important over winter because rodents find paper filter media irresistible as nesting material, and a chewed-up filter element is a guaranteed path for unfiltered air into the cylinder.

Battery Care for Electric and Riding Mowers

Batteries are the second most winter-damaged component after fuel systems, and they fail silently until the first spring start attempt. Cold weather does two damaging things to lead-acid batteries: it slows the chemical reaction inside the cells (reducing cranking amps by 30-50% at 0°F compared to 80°F), and it allows any battery left in a partial state of charge to sulfate. Sulfation – the formation of hard lead sulfate crystals on the plates – permanently reduces capacity even after the battery is recharged. Lithium-ion batteries have different chemistry but still degrade if stored fully charged or fully dead.

For riding mowers with traditional lead-acid batteries, the gold standard is a battery tender (also called a trickle charger or maintainer). Quality units like Battery Tender Junior, NOCO Genius, or Deltran maintain a constant float voltage that holds the battery at 100% charge without overcharging or boiling off electrolyte. Connect the tender’s alligator clips or ring terminals before storage and leave it plugged in for the entire off-season. If you don’t have a tender, remove the battery entirely and bring it indoors to a climate-controlled space (a basement or closet works fine). Place the battery on a wood shelf, never directly on concrete – concrete floors were once thought to drain batteries through their cases, but the real reason is temperature. Concrete stays colder than wood and contributes to capacity loss.

Lithium-ion mower batteries require a different storage protocol. Most manufacturers (EGO, Greenworks, Ryobi, DeWalt) specify a 40-60% state of charge for long-term storage. Storage at 100% stresses the cells and reduces cycle life; storage at 0% can push the cells below their minimum voltage threshold and permanently brick the pack. Charge or discharge the battery to the recommended range, then store it indoors in a space that stays between 40-70°F. Check the charge level monthly during storage and top up to 50% if it drops below 30%.

Blade Maintenance and Sharpening

Winter is the perfect window for blade work because you’re already in the garage, the mower isn’t needed for several months, and you have time to do the job right. A sharp blade cuts grass cleanly, leaving a healthy tip that heals quickly. A dull or nicked blade tears grass, leaving ragged brown tips and stressing the plant. Over a season, dull blades also force the engine to work harder, burning more fuel and accelerating wear on the belt, spindle, and bearings.

Remove the blade by loosening the center bolt (right-hand thread, so turn counter-clockwise). Use a block of wood wedged against the deck to keep the blade from spinning while you break the bolt loose. Mark which side faces down before removal so the reinstalled blade goes back in the correct orientation. Inspect the blade for bends, cracks, deep gouges, or wear along the cutting edge. A blade worn down to less than two-thirds of its original width should be replaced rather than sharpened. Small nicks can be filed smooth, but a blade that has struck a rock or stump hard enough to bend is unsafe to reuse – the bend may not be visible to the eye, but it puts the blade out of balance.

Sharpen with a 10-inch bench grinder or a 4.5-inch angle grinder, holding the original cutting angle (usually 30-35 degrees for most mower blades). Remove equal amounts of metal from both cutting edges so the blade stays balanced. After sharpening, hang the blade on a nail through the center hole and check that it sits level. If one end dips, file a little more metal from the heavy end until it balances. An unbalanced blade produces vibration that loosens the blade bolt, wears out spindle bearings, and cracks the deck over time. Before reinstalling, coat the blade with a thin layer of light machine oil or spray lubricant to prevent rust over winter. Torque the blade bolt to specification (typically 35-40 ft-lbs for walk-behinds, 50-70 ft-lbs for riding mowers).

Choosing the Right Storage Location

The ideal winter storage location is dry, ventilated, and stays above freezing. A heated garage tops the list because it satisfies all three conditions. Unheated garages work fine for mowers with properly winterized fuel systems and removed batteries – the temperature swings don’t harm a sealed engine if the gas is stabilized or drained and the battery is indoors. Basements are acceptable but bring humidity concerns; if your basement is damp, run a dehumidifier or place desiccant bags (silica gel or DampRid) around the mower to absorb moisture. Climate-controlled storage units are an option if you lack garage space and the rental cost makes sense for protecting a high-value zero-turn or garden tractor.

Sheds with dirt or gravel floors are the toughest environment because ground moisture wicks up through the floor and condenses on every cold metal surface inside the shed. If a shed with a dirt floor is your only option, lay down a 4×8 sheet of plywood or a heavy tarp as a moisture barrier, then place the mower on top. The goal is to keep the mower’s metal surfaces above the dew point as the temperature fluctuates between day and night.

Outdoor storage under a tarp is workable but demands extra attention to detail. Use a breathable, waterproof mower cover rather than a blue polyethylene tarp – plastic tarps trap condensation against the metal and accelerate rust rather than prevent it. Elevate the mower off the ground on pallets or cinder blocks to keep the bottom of the deck out of standing water and snowmelt. Weigh down each corner of the cover with a brick or strap the cover with bungee cords to keep winter winds from ripping it off.

Security matters for high-value equipment. Riding mowers, zero-turns, and higher-end robotic mowers are theft targets, especially in areas where outdoor storage is the only option. A heavy-duty cable lock threaded through the frame and around an anchor point deters casual theft. Removing the ignition key, the battery, or even one wheel makes the mower harder to move quickly. Document the serial number and photograph the equipment before storage; the records help with insurance claims and police reports if theft does occur.

Special Considerations for Different Mower Types

Riding Mowers and Zero-Turn Models

Riding mowers add several winterization steps beyond fuel, oil, and battery. Inflate all four tires to the maximum PSI listed on the sidewall (this prevents flat-spotting during months of stationary weight). Clean the deck thoroughly, including the discharge chute, baffles, and any bagging attachment. Wash off all grass debris and let the deck dry completely. Lubricate every grease fitting with chassis-grade grease (most riding mowers have 4-6 zerks on the front axles, spindles, and pivot points). Check the transaxle fluid level on hydrostatic-drive models; top off with the manufacturer-specified fluid if it reads below the upper mark on the dipstick. Engage the parking brake lightly to keep the pads from sticking to the rotors, but do not fully compress the spring.

Electric and Battery-Powered Mowers

Electric mowers skip fuel and oil but still need a winter once-over. Clean the deck and underside, then dry everything completely. Inspect the power cord on corded models for nicks, cracked insulation, or damaged prongs – replacing a $20 cord now is cheaper than the alternative. For battery models, remove the battery pack and follow the lithium-ion storage procedure above (40-60% charge, indoor storage). Clean the battery contacts and the mower’s contact terminals with electrical contact cleaner and a soft brush. Apply a thin layer of dielectric grease to the contacts to prevent corrosion.

Robotic Mowers

Robotic mowers require the most involved off-season prep of any mower type. Clean the unit thoroughly, paying attention to the wheel wells, sensor lenses, and charging contacts on the bottom of the chassis. Remove the battery and store it indoors at 40-60% charge. Bring both the mower and the charging station inside – leaving the charging station outside exposes the transformer and boundary wire connections to freeze-thaw cycles that crack solder joints and degrade insulation. Update the firmware through the manufacturer’s app before storage if updates are available. Photograph the boundary wire layout, especially around obstacles and slopes, so any wire damage from winter weather can be repaired accurately in spring.

Creating a Maintenance Checklist

A printed checklist keeps the workflow organized and ensures no step gets missed when you’re halfway through and eager to finish. The lists below are organized by mower category. Print one and keep it near your storage area for future reference.

Gas Push Mower Checklist:

• Scrape the deck, rinse, and dry completely
• Drain fuel or treat with STA-BIL in fresh gas (1 oz per 2.5 gal)
• Run engine 10 minutes if using stabilizer
• Warm engine, drain oil, refill with fresh oil to spec
• Replace spark plug (gap 0.030 in) and air filter element
• Remove, sharpen, balance, and reinstall the blade
• Lubricate cables, height adjusters, and wheel pivots
• Apply rodent deterrence (see Rodent Prevention below)
• Cover or store indoors in a dry space

Riding Mower and Zero-Turn Additions:

• Inflate tires to maximum PSI rating
• Grease every chassis fitting
• Check hydrostatic transmission fluid level
• Inspect and replace drive belts if worn
• Remove and store battery at full charge on a tender or indoors
• Level the deck per manufacturer spec (record the measurement)

Electric and Battery-Powered Mower Checklist:

• Clean the deck and dry completely
• Remove the battery and charge to 40-60% capacity
• Clean battery and mower contacts with electrical cleaner
• Apply dielectric grease to the contacts
• Inspect cord for damage on corded models
• Lubricate wheels, axles, and height-adjust mechanisms
• Store indoors in a dry, temperature-controlled area

Common Winter Storage Mistakes to Avoid

The repair bills that show up every spring trace back to the same handful of mistakes, year after year. The single most expensive mistake is leaving untreated gasoline in the tank through a full winter. By spring, that fuel has phase-separated and varnished the carburetor. Repair costs average $75-150 for a push mower and $200-400 for a riding mower fuel system.

Storing the mower without cleaning the deck ranks second on the cost list. Grass clippings hold moisture against the metal, and a single winter of wet clippings against bare steel eats through the deck. Five minutes of scraping and a garden hose prevents a deck replacement that costs $200 or more.

Leaving the battery connected in an unheated space kills the battery and occasionally the charging system. A frozen lead-acid battery cracks its case, leaks sulfuric acid onto the frame, and damages the alternator or charging stator. Replacement runs $50-100 for the battery alone, and acid cleanup adds labor.

Storing a mower with a dirty or missing air filter invites rodent damage. Field mice and voles find paper filter media irresistible as nest building material, and the resulting debris falls directly into the carburetor throat. Always install a fresh filter or seal the air intake opening with a plastic bag and rubber band for storage.

Finally, periodically starting the engine during storage does more harm than good. A cold-start that runs for 30 seconds produces condensation inside the engine block and exhaust system. The moisture has no chance to evaporate before the engine cools again, accelerating internal corrosion. If fuel is stabilized and the oil is fresh, the engine does not need to run until spring.

Rodent and Pest Prevention During Storage

Rodent damage is one of the most expensive yet least-discussed winter storage problems. Mice, rats, chipmunks, and squirrels treat stored mowers as ready-made homes. They chew spark plug wires, coil insulation, air filter media, fuel lines, and seat cushions. They pack grass, insulation, and food scraps into the air intake, exhaust pipe, and engine cooling fins. A single mouse can nest in an engine bay overnight and cause hundreds of dollars in damage before you ever start the mower.

The most effective deterrent is denying access. Stuff the exhaust pipe with a rag or steel wool (remove before spring startup). Seal the air intake opening with a plastic bag secured by a rubber band. Cap any openings around the steering shaft, cables, or wiring harnesses with steel wool – mice can squeeze through a hole the diameter of a pencil. Place snap traps or bait stations in the corners of the storage area, away from the mower itself so curious pets don’t reach them.

Strong-smelling natural repellents give an extra layer of deterrence. Peppermint oil-soaked cotton balls placed in the engine bay, near the air filter, and around the storage perimeter repel most rodents. Mothballs are another option but only in enclosed spaces (never in a residential garage with shared ventilation). Many owners also report success with ultrasonic repellent devices, although field results vary. Combining two or three methods – exclusion plus traps plus scent – covers the gaps any single method leaves open.

Before the first spring start, do a thorough pre-start inspection. Look for nests in the air filter housing, droppings on the deck, gnaw marks on wires, and frayed insulation. A 60-second walkaround catches problems before they get into the working engine or are sent up into your face from a spinning blade.

Spring Startup Preparation

When the last frost passes and grass starts actively growing, give the mower a 10-minute pre-start inspection before cranking it for the first time. Check the oil level on the dipstick and top off if it reads below the lower mark. Add fresh gasoline to the tank if you drained it the previous fall (or if the stabilized fuel from last season has been sitting more than 12 months, treat it as old and replace it). Inspect the spark plug wire for any chew marks from rodents over winter, and verify the plug is tight. Inspect belts for cracking or glazing and replace any that show wear.

Prime the engine by pressing the primer bulb three to five times (consult the manual – some engines require no priming, some require more). For riding mowers, reconnect the battery (positive cable first, then negative), then turn the key and crank for no more than 5 seconds at a time, with 15-second rests between attempts. If the engine doesn’t fire within three or four attempts, stop cranking and troubleshoot rather than flooding the cylinders.

Once running, let the engine idle for 2-3 minutes to warm up, then engage the blades (with the parking brake on) and observe. Listen for unusual knocking, squealing, or rough idle. Walk the perimeter of the deck and look for oil drips, loose hardware, or wobble. Run the mower under light load for 10-15 minutes before any serious cutting. This burn-off evaporates any residual moisture in the exhaust and oil pan from months of cold storage.

Professional Service vs. DIY

Most winterization tasks are well within the skill set of a homeowner with basic hand tools and an afternoon of free time. The DIY cost for a typical push mower works out to about $15-25 in supplies (oil, spark plug, stabilizer, optionally a new air filter) and 60-90 minutes of work. A riding mower DIY runs $30-50 in supplies (oil, filters, plugs, grease) plus about 2 hours. Those numbers assume you already own basic hand tools and a jack or ramps for the riding mower.

Professional winterization at a small engine shop runs $75-150 for a push mower and $150-250 for a riding mower, depending on the services included. Dealers often bundle winterization with a spring tune-up discount, which improves the value. The break-even favors professional service if you’re not comfortable doing the work yourself, you lack tools, or you don’t have a flat workspace. Professional service also makes sense for fuel-injected engines, complex hydrostatic transmissions, or mowers under warranty where dealer documentation of seasonal maintenance preserves coverage.

For most homeowners, DIY winterization is the right answer. The skills are straightforward, the tools are minimal, and you learn your mower’s condition firsthand. The savings versus professional service pay for your mower’s annual maintenance in a single season. The exception is if you discover a problem during winterization that requires deeper work – a bent valve, a seized engine, a cracked deck. In those cases, the cost of professional repair is justified by avoiding further damage.

Environmental Considerations

Used motor oil is a regulated hazardous waste. Never pour it down a drain, onto the ground, or into regular trash. Auto parts stores (O’Reilly, AutoZone, NAPA) accept used oil for free recycling, as do most municipal waste facilities. Oil that has been contaminated with gasoline (from a leak or a partially failed engine) is still accepted at these drop-off points.

Old gasoline is a hazardous waste and a fire hazard. The safest disposal methods are mixing it with fresh gasoline at a 1:10 ratio in your car’s fuel tank (old gas at this dilution burns without issue in modern vehicles) or bringing it to a household hazardous waste collection event. Many counties run these events quarterly; check with your local solid waste department for the schedule near you.

Switching to ethanol-free fuel (sold at many gas stations and marinas under brands like TruFuel, Rec Fuel, or Ashland) eliminates the ethanol-related fuel system problems discussed earlier. Ethanol-free gas costs a premium but stores indefinitely in sealed containers, which reduces the need for stabilizer and extends the life of every small engine you own. Most users report the higher fuel cost pays for itself within two seasons by avoiding a single carburetor cleaning.

Frequently Asked Questions

Conclusion

Storing a lawn mower for winter is one of those small habits that pays off for as long as you own the equipment. The hour spent draining or stabilizing fuel, swapping the oil, pulling the battery, and sealing the engine against rodents saves both an expensive spring repair bill and the morning frustration of a mower that won’t fire. Every make and model shares the same core winterization principles: protect the fuel system from oxidation and moisture, change the oil so it doesn’t turn acidic indoors, remove or maintain the battery through the cold months, and keep the machine in a dry, ventilated space that mice can’t access.

If you only do the bare minimum, do this: clean the deck, drain or stabilize the fuel, remove the battery, and store indoors. Those four steps prevent more than 90% of winter damage based on what small engine shops see every spring. If you have an extra 30 minutes, also change the oil, sharpen the blade, and seal the air intake and exhaust against pests. Your mower will start on the first or second pull when the grass starts growing again, and you’ll skip the trip to the repair shop that catches so many of your neighbors.

Take care of your equipment through the off-season and it will take care of your lawn for many seasons to come. Bookmark this guide, print the checklist at the end of the fuel management section, and use it each fall as a reminder of every step that needs to happen before the first hard frost.