How To Store A Lawn Mower For Winter: Pro Tips For 2026

Winterizing your lawn mower is one of those chores that takes 45 minutes now but saves you hours of frustration—and a potentially expensive repair bill—come spring. I've spent years working on mowers that failed to start in April, and in nearly every case, the root cause traces back to how they were parked in October. Old fuel, moisture, and neglect do more damage than the cold itself. This guide walks you through a complete, proven winter storage routine that protects your investment and ensures your mower fires up on the first pull next season.

An illustrated rundown of the essential pre-storage checks that prevent spring no-starts.

Source: ocj.com

Why Winter Storage Matters More Than You Think

The cold season isn't the enemy—it's the chain of events that cold weather sets in motion. The biggest culprit is ethanol-blended gasoline. Ethanol is hygroscopic, meaning it actively pulls moisture from the air. Over a few months, that water separates from the fuel, sinks to the bottom of your carburetor bowl, and initiates a corrosion chain reaction. The result is gummed-up jets, clogged passages, and a carburetor that needs a full rebuild rather than a simple cleaning. You can also read our guide on how to start a leaf blower.

What else happens when a mower sits neglected?

• Fuel degrades into sticky varnish within 60–90 days, even faster with ethanol blends.
• Motor oil becomes acidic as combustion byproducts accumulate, eating away at soft engine bearings.
• Batteries self-discharge and suffer permanent damage from deep discharge in freezing conditions.
• Rubber components—belts, hoses, tires—dry out, crack, and flatten.
• Rust forms on bare metal surfaces, especially the cutting deck, when moisture is trapped against it.
• Rodents see your mower as prime real estate, nesting in air filters and chewing through wiring harnesses.

Each of these is a preventable problem. A systematic winterization routine addresses them all in a single afternoon. Beyond the mechanics, there's a financial angle: a well-maintained mower has a significantly longer service life, delaying the need for a costly replacement.

Tools and Supplies Checklist

Before you begin, assemble everything so you aren't hunting for tools with grease on your hands. Here's what a complete winterization kit looks like:

• Fuel stabilizer (formulated for ethanol-blended fuels)
• Fuel siphon pump or a drain pan (if you plan to run the tank dry)
• Fresh gasoline (if you'll be running stabilized fuel through the system)
• Engine oil (correct viscosity as specified in your owner's manual) and a new oil filter if your model has one
• New spark plug and air filter, if they're due for replacement
• Fogging oil (for engines stored more than 90 days)
• Battery maintainer (for riding mowers or any mower with a battery)
• Deck scraper, stiff brush, and mild soap
• Silicone spray or light machine oil for metal protection
• Clean rags, gloves, and a drain pan
• Wooden blocks or a sturdy stand for lifting and inspecting the mower
• Rodent deterrents if your storage space has a history of pests

Your owner's manual is the definitive reference for specific oil grades, spark plug types, and maintenance intervals. When in doubt, consult it before you start. You can also read our guide on how to care for lawn during dry season.

A well-organized storage area keeps your winterization supplies and equipment accessible and protected.

Source: indylawnmowerrecycle.com

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

The following steps apply to the vast majority of push, self-propelled, and riding mowers. Always prioritize safety: disconnect the spark plug wire before working under the deck on gas models, and unplug or remove batteries on electric models.

Step 1: Clean the Deck and Frame Thoroughly

A clean mower is a healthy mower. Grass clippings and dirt trap moisture against metal, creating the perfect environment for rust.

• Brush off all loose grass from the top of the deck, around the wheels, and in every crevice.
• Tip the mower onto its side with the carburetor and air filter facing upward. This is critical—tipping it the other way can cause oil and fuel to flood the air box.
• Scrape away caked-on grass from the underside of the deck using a putty knife or a specialized deck scraper.
• Wash the deck with mild soap and water. Avoid a pressure washer, which can force water into bearings and seals.
• Dry everything completely—a leaf blower works well, or let it sit in the sun for an hour.
• Apply a light coat of silicone spray or a thin layer of oil to the bare metal of the deck underside. This acts as a rust barrier through the humid winter months.

A practical tip from the shop: after cleaning, I always let the mower sit in the sun or near a fan for at least an hour. Metal that's completely dry won't rust.

Step 2: Deal with Fuel the Right Way

You have two equally valid approaches to fuel management. Choose one and execute it correctly.

Option A: Run the Tank Dry

• During your final mow of the season, use up as much fuel as possible.
• Once the mower begins to sputter, let it idle until it stalls completely.
• Try starting it once more to clear any remaining fuel from the carburetor and fuel lines.

Option B: Use Fuel Stabilizer

• Add a quality stabilizer to a nearly full tank of fresh gas, following the label's dosage instructions.
• Run the mower for 5–10 minutes to ensure the treated fuel circulates through the entire fuel system, including the carburetor.
• Top the tank off to about 95% capacity to minimize air space and condensation.

In my experience, the stabilizer method is the better choice for modern engines with plastic fuel components and delicate carburetor circuits. It keeps seals lubricated and prevents them from drying out. For older mowers, running the tank dry is a tried-and-true method that leaves nothing behind to degrade.

Step 3: Change the Oil

This is non-negotiable. Old oil contains acids and moisture that corrode internal engine parts during months of inactivity.

• Run the engine for a few minutes to warm the oil—warm oil flows quickly and carries more contaminants out with it.
• Drain the oil into a suitable pan. Dispose of it properly at a local recycling center.
• Refill with the correct grade and amount of fresh oil as specified in your manual.
• Replace the oil filter if your engine has one.

Fresh oil neutralizes acids and provides a protective film that prevents rust from forming on internal components.

Step 4: Service the Air Filter and Spark Plug

A dirty air filter can cause starting problems in the spring and allows debris into the engine. A fresh spark plug ensures reliable ignition.

• Paper air filters: Replace them if they're dirty or if they've been in service for a full season.
• Foam air filters: Wash them in warm soapy water, rinse thoroughly, and allow to dry. Then apply a light coat of air filter oil.
• Spark plug: Remove the plug and inspect it. If the electrode is worn or the ceramic is cracked, replace it. Even if it looks clean, consider replacing it annually—it's cheap and effective preventive maintenance.
• Fog the cylinder: With the spark plug removed, add a small amount of fogging oil directly into the cylinder. Pull the starter rope a few times to distribute the oil, then reinstall the spark plug. This coating protects the piston rings and cylinder walls from corrosion.

Step 5: Battery Care for Electric and Riding Mowers

Batteries are the most common casualty of improper winter storage.

• Riding mowers: Disconnect the negative battery cable first, then the positive. Clean any corrosion from the terminals. Store the battery in a cool, dry place (not on a concrete floor, which can retain moisture) and connect it to a smart maintainer to keep it at optimal charge.
• Battery-electric mowers: Remove the battery packs entirely. Store them indoors at a temperature between 50–75°F. Aim for a partial charge of 40–60%—this is the ideal range for lithium-ion cells to minimize degradation. Do not leave them on a charger, even a "smart" one, for months on end. Check and top up the charge every couple of months if the manual recommends it.

Step 6: Inspect Belts, Blades, and Cables

This is your chance to complete small maintenance tasks now, saving you time and effort in the spring.

• Inspect belts for cracks, fraying, or glazing. Replace any belt that shows signs of significant wear.
• Sharpen and balance the blade. A sharp blade makes a tremendous difference in cut quality. If you're not comfortable doing this yourself, many hardware stores offer sharpening services for a nominal fee. Your favorite garden tool sharpener can also be used for your mower blade.
• Lubricate cables and pivot points with a dry lubricant or light machine oil. This prevents them from seizing and keeps the control mechanism smooth.

Step 7: Tires and Frame Positioning

Proper positioning prevents damage during prolonged storage.

• Riding mowers: Inflate tires to the recommended PSI (printed on the sidewall) to prevent flat spots. Consider using blocks or jack stands to take the weight off the tires if you're storing for more than a few months.
• Push mowers: Store upright on all four wheels. Avoid hanging the mower by its handle—this can permanently bend the handle or cause oil to leak into the air filter.

Step 8: Store in a Dry, Safe Place

The final step is choosing and preparing the right storage environment.

• Select a clean, dry area with some airflow. A garage or shed is ideal.
• Keep the mower off bare concrete. Concrete holds and wicks moisture. Place it on a wooden pallet, a rubber mat, or a piece of plywood.
• Cover it with a breathable material. A canvas mower cover is ideal. If you use a tarp, it must be breathable—plastic traps condensation and accelerates rust.
• Set out rodent deterrents. Peppermint oil packs or sealed bait stations are effective options. Check them periodically throughout the winter.
• For riding mowers, consider chocking the wheels to prevent any accidental movement.

A clear, step-by-step visual planner for executing the full winterization process.

Source: thespruce.com

Special Notes by Mower Type

Each type of mower has its own quirks that deserve attention during winterization.

Gas Push and Self-Propelled Mowers

• These typically use four-stroke engines and E10 gasoline. Treat the fuel or run it dry as described above.
• Fogging the cylinder is especially beneficial if storage will extend beyond three months.
• Ensure the air filter is clean and completely dry before storing.

Battery-Electric Push Mowers

• Always remove the battery packs and store them separately in a cool, dry indoor location.
• Carefully clean grass clippings from the cooling vents and the underside of the deck. Clogged airflow is the leading cause of motor failure.
• Store the charger indoors and don't cover it while in use—it generates heat and needs ventilation. Pay attention to how long electric mower batteries last so you can plan your storage strategy accordingly.

Riding Mowers and Lawn Tractors

• Follow the full fuel treatment or draining procedure.
• Change the oil and filter.
• Grease all fittings per the owner's manual.
• Thoroughly clean the deck, both top and underside. Grass buildup here is a prime nesting spot for rodents.
• Disconnect the battery and keep it on a maintainer.

Robotic Mowers

• Clean the sensors and wheels to ensure proper operation next season.
• Remove the battery if the manufacturer's instructions recommend it.
• Bring the charging base indoors if possible.
• Check for and install any pending firmware updates before you put it away—this is a common point of failure come spring.

Tailor your storage plan to the specific type of mower you own.

Source: neoutdoor.com

Where and How to Store if Space is Tight

Not everyone has a spacious garage. Here's how to adapt the process for tighter quarters or unconventional storage locations.

• Garage or Shed: This is the best-case scenario. Choose a dry corner and focus on airflow. A bucket of desiccant can help control humidity in a closed space.
• Basement: This is only safe for electric mowers. Never store a gas mower or any fuel indoors near a flame source like a water heater or furnace. The EPA provides clear guidance on safe fuel storage that is worth reviewing.
• Outdoor Shed Without Power: Elevate the mower on a pallet to keep it off the cold, damp ground. Use a breathable cover on the mower and, if possible, improve ventilation by opening a vent or louver.
• Under a Deck or Overhang: As a last resort, this can work. Prioritize getting the mower off the ground and protecting it with a breathable cover. Check on it periodically to ensure it stays dry.
• Self-Storage Unit: Many facilities prohibit storing fuel-powered equipment. Verify the rules before you commit. If allowed, drain the fuel system completely to avoid fumes and fire risk.

Common Mistakes to Avoid

Learn from the errors I see in the shop every year.

• Leaving old fuel in the carburetor. This is the single most common cause of spring no-starts. Untreated fuel turns to varnish and plugs the tiny jets.
• Using a plastic tarp as a cover. It traps condensation on the mower's metal surfaces, guaranteeing rust. Use a breathable cover.
• Storing with a weak battery. A battery at full discharge over winter can be permanently damaged and will need replacement.
• Skipping the oil change. The acids in old oil will etch bearings and other soft metal parts during a long storage period.
• Hanging the mower by the handle. This bends the handle and can cause oil to leak from the engine into areas it shouldn't.
• Ignoring rodents. They can do hundreds of dollars in damage by chewing through wiring and building nests in filters. Use deterrents proactively.

Spring Wake-Up Checklist

When warm weather returns, this quick routine gets your mower back into action.

• Remove the cover and inspect for any leaks, animal nests, or loose components.
• Reinstall the battery or reconnect the cables.
• Check the oil level, air filter, and blade tightness.
• Add fresh fuel if you ran the tank dry.
• Start the mower and let it run. Listen for a smooth idle and responsive throttle.

Checking the correct fuel type before you refill in spring can prevent a whole host of performance issues down the road. A little time spent here is your reward for a proper winterization.

A brief inspection and service checklist for the first mow of the new season.

Source: bhg.com

Frequently Asked Questions

Should I run the tank dry or use a fuel stabilizer?

Both are effective methods. Using a stabilizer with fresh gas is my preferred choice for modern engines as it keeps fuel system seals lubricated and prevents the carburetor from drying out. Running the tank dry is a straightforward, foolproof method for older machines.

How long does fuel last with a stabilizer?

Most quality stabilizers protect fuel for 6–12 months. It's essential to follow the label directions and run the engine so the treated fuel reaches the carburetor.

Do I need to fog the engine?

Fogging is a beneficial extra step if you're storing your mower for more than 90 days or in a damp environment. It leaves a protective oil film on the cylinder walls, preventing rust on the piston rings.

Can I store my mower outside under a tarp?

Yes, but avoid a plastic tarp at all costs. Use a breathable cover and elevate the mower on a pallet to keep it clear of ground moisture.

What is the right battery storage level for lithium packs?

Store lithium-ion packs at approximately 40–60% charge in a cool, dry environment. Check and top up the charge every couple of months if your manual recommends it.

Is it safe to tip a mower on its side to clean the deck?

Yes, but only with the carburetor and air filter side facing up. This orientation prevents oil and fuel from flooding the air box.

How often should I replace the spark plug?

A common interval is every 1–2 seasons. If you notice hard starting or a rough idle, replace it sooner rather than later.

Conclusion

Winterizing your lawn mower doesn't need to be complicated. Break it down into a simple sequence: clean the deck, treat or drain the fuel, change the oil, service the filter and plug, protect the battery, and store it in a dry, airy location. By following this plan, you're not just preventing a no-start—you're extending the life of your equipment and saving yourself both time and money.

Take one hour this weekend to run through this checklist. Your future self, standing in the spring sunshine with the smell of cut grass in the air, will thank you. Set up your space, gather a small winterization kit, and you'll never have to wonder how to store your mower again. If you're looking to improve your overall lawn health next season, you can also read about building better soil while you're planning your spring routine.