Storing your lawn mower correctly in the garage ensures it stays ready for next season and extends its lifespan. This guide walks you through step-by-step preparation, from draining fuel to protecting the engine, so your mower is always in peak condition. Follow our tips to avoid common mistakes and make spring start-up a breeze.
Storing your lawn mower properly in the garage isn’t just about making space—it’s about protecting your investment and ensuring reliable performance when you need it most. Whether you own a gas-powered push mower, a riding mower, or an electric model, improper storage can lead to corrosion, clogged fuel lines, hard starts, and shortened engine life. This comprehensive guide will walk you through every step of preparing and storing your lawn mower in the garage so it’s ready to go when spring arrives.
By following these simple but essential steps, you’ll avoid common pitfalls like fuel degradation, rust, and battery drain. Plus, you’ll save time and money by preventing costly repairs down the road. Let’s get started!
Key Takeaways
- Clean the mower thoroughly before storing—remove grass clippings, debris, and dirt from under the deck and around the engine.
- Drain or treat fuel to prevent varnish buildup; use a fuel stabilizer if storing with fuel in the tank.
- Change the oil and filter if needed, especially after heavy use or before long-term storage.
- Remove the spark plug and add a few drops of oil into the cylinder to prevent moisture and rust.
- Store in a dry, cool place away from direct sunlight and moisture to protect all components.
- Use a protective cover designed for lawn mowers to shield against dust and accidental spills.
- Check on your mower monthly during storage to ensure it remains in good condition.
Step 1: Clean Your Lawn Mower Thoroughly
Before you even think about putting your mower away, give it a full cleanup. Dirt, grass clippings, and moisture trapped in crevices create ideal conditions for mold and corrosion. A clean mower not only stores better but also prevents future problems.
How to Clean the Deck and Undercarriage
After mowing, turn off the engine and disconnect the spark plug wire for safety. Tilt the mower on its side (carburetor side up to prevent oil leaks) and spray the underside with a hose or use a pressure washer on low setting. Scrub stubborn residue with a stiff brush. Never blast water directly into air filters or electrical components.
Wipe Down Exterior Surfaces
Use a damp cloth to wipe the engine block, handles, and plastic parts. Dry everything completely before moving to the next step. This reduces the chance of rust forming on metal surfaces.
Tip:
Consider washing your mower after every major use. It makes storage prep easier and keeps your equipment looking great year-round.
Step 2: Drain or Treat the Fuel
Gasoline breaks down over time—especially when left sitting for weeks or months. Storing fuel that’s more than 30 days old without treatment can gum up the carburetor and fuel lines, making restarting frustrating.
For Gas-Powered Mowers:
If your mower has been used recently and the fuel is fresh (less than 30 days old), add a quality fuel stabilizer according to the bottle instructions. Run the engine for 5–10 minutes to circulate treated fuel through the system. Then shut off the mower and let it sit for at least 15 minutes.
For Long-Term Storage (Over 6 Months):
Drain the fuel tank and carburetor bowl completely. Use a siphon pump or carefully tilt the mower (carburetor side up) and drain into a sealed container. Dispose of old fuel responsibly at an auto parts store or hazardous waste facility.
Why This Matters:
Untreated fuel can form varnish-like deposits that block tiny passages in the carburetor. That’s why learning how to clean a lawn mower carburetor before storage is so important.
Step 3: Change the Oil (Optional But Recommended)
Oil can absorb moisture and contaminants over time, especially after a busy mowing season. While not mandatory, changing the oil before storage helps protect internal engine components.
When to Change Oil:
– After every 25–50 hours of operation
– If the oil looks dirty or smells burnt
– Before long-term storage
How to Change Oil Safely:
– Warm up the engine briefly (this thins the oil for easier draining).
– Place a drain pan under the oil drain plug.
– Remove the plug and let oil flow out completely.
– Replace the drain plug and refill with fresh oil as per manufacturer specs.
For specific models like Toro or Honda, check our guides such as How To Change Oil In A Toro Lawn Mower or How To Change The Oil In A Honda Lawn Mower for tailored instructions.
Step 4: Protect the Engine from Rust
Moisture is the enemy of small engines. Even in a garage, humidity and temperature swings can cause condensation inside the combustion chamber.
Remove the Spark Plug:
Locate the spark plug using your owner’s manual. Carefully remove it with a socket wrench. Once removed, pour about ½ teaspoon of fresh motor oil into the cylinder through the spark plug hole. Gently rotate the crankshaft several times using the recoil starter cord (or electric starter if available) to distribute the oil evenly. This coats the cylinder walls and prevents rust formation.
Reinstall the Spark Plug Later:
Leave the spark plug out until spring. You can wrap the opening with plastic wrap to keep dust out.
Step 5: Disconnect and Store the Battery (If Applicable)
Most riding mowers and some larger push mowers have rechargeable batteries. Leaving them connected during long storage causes slow discharge and sulfation—damaging the battery permanently.
Steps to Store a Battery Safely:
– Turn off all switches and remove the key.
– Disconnect the negative terminal first, then the positive.
– Clean the terminals with a baking soda solution if corroded.
– Store the battery in a cool, dry place—ideally on a shelf or in a battery box.
– Check the charge level monthly and recharge if below 70%.
Tip:
Some mowers come with battery disconnect switches—use those if available.
Step 6: Cover and Secure Your Mower
Even in a garage, dust, rodents, and accidental spills can damage your mower. A proper cover provides peace of mind.
Choose the Right Cover:
Look for a breathable, waterproof cover designed specifically for lawn mowers. Avoid plastic bags—they trap moisture and promote rust.
Positioning Tips:
– Place the mower on a flat surface or caster wheels elevated slightly off the floor.
– Ensure the cover doesn’t touch wet concrete or damp walls.
– Tuck the edges under the deck or frame to keep critters out.
Bonus Tip:
Label the cover with the current date so you remember when it was stored.
Step 7: Perform Monthly Checks During Storage
Don’t set it and forget it! Every month, do a quick visual inspection:
– Is the cover still securely in place?
– Are there signs of pests or moisture?
– Is the battery still holding charge?
– Does anything look loose or damaged?
Address any issues immediately to prevent bigger problems later.
Troubleshooting Common Storage Issues
Even with perfect prep, unexpected problems can arise. Here’s how to handle them:
Problem: Mower Won’t Start After Storage
Causes: Old fuel, clogged carburetor, wet spark plug, or dead battery.
Solutions: Drain fuel, clean or replace the carburetor, dry/replace the spark plug, and jump-start or recharge the battery. For stubborn cases, refer to guides like How To Start A Lawn Mower After Sitting All Winter.
Problem: Strange Smells or Smoke When Starting
Causes: Contaminated fuel, oil leaks, or carbon buildup.
Solutions: Inspect fuel lines and filters. Check for oil leaks around gaskets. If smoke persists, consult a professional.
Problem: Rust on Metal Parts
Prevention: Always drain fluids, use stabilizer, and apply light machine oil to exposed metal surfaces before covering. Wipe down after cleaning.
Conclusion
Storing your lawn mower in the garage doesn’t have to be stressful. With these straightforward steps—cleaning, fuel management, oil care, rust prevention, and proper covering—you’ll preserve your mower’s performance and extend its life significantly. Remember, a little effort now saves headaches later. By investing time in proper storage, you’re not just tidying up your garage—you’re ensuring your mower is always ready to deliver a perfectly manicured lawn when the warm weather returns.
Take pride in your yard work routine. Your mower deserves the same care you give your lawn.