Winterizing your riding lawn mower ensures it starts reliably when spring arrives. This guide walks you through draining or treating old fuel, changing the oil, sharpening blades, and storing your mower safely. With simple steps, you’ll protect your investment and extend its life.
Welcome! If you own a riding lawn mower, you know how much joy (and relief) comes from a perfectly manicured yard. But when fall rolls around and snow begins to fall, that same machine needs care—especially if it won’t be used again until spring. Winterizing your riding lawn mower isn’t just about convenience; it’s essential for preserving performance, preventing costly repairs, and ensuring your mower starts right when you need it next season.
This comprehensive how-to guide will walk you through every step of winterizing your riding lawn mower. Whether you’ve got a John Deere, Craftsman, Cub Cadet, or any other brand, these steps apply universally. By following this process, you’ll protect your investment, avoid common pitfalls, and enjoy peace of mind knowing your mower is ready to roar back to life come spring. Let’s get started!
Key Takeaways
- Drain or treat old fuel: Old gas can gum up the engine. Either drain the tank or add a stabilizer before storage.
- Change the oil and filter: Fresh oil prevents sludge buildup and keeps internal components protected.
- Clean and sharpen blades: Dull or damaged blades tear grass instead of cutting cleanly—so inspect and sharpen them.
- Lube moving parts: Grease the deck, steering, and other pivot points to prevent rust and stiff operation.
- Store in a dry place: Always keep your mower indoors or under cover to avoid moisture damage.
- Remove the battery: If your mower has one, take it out and store it separately to prevent corrosion.
- Check tires and level surface: Flat spots won’t form if stored on a stable, level surface—and proper tire pressure matters even in winter.
Why Winterizing Matters
Before diving into the “how,” let’s talk about the “why.” Riding lawn mowers contain small engines that rely on precise fuel-air mixtures to run. When gasoline sits in the carburetor or fuel lines for months without being burned, it breaks down into gummy residues called varnish and gum. These clog fuel passages, gum up the carburetor, and make starting nearly impossible—even after weeks of storage.
Beyond fuel issues, moisture from condensation inside an unprotected engine can cause rust. Oil thickens in cold temperatures, leading to poor lubrication. And if blades sit crooked or decks aren’t cleaned, corrosion or blade warping can occur.
Winterizing addresses all these problems. It’s not just a chore—it’s preventive maintenance that saves time, money, and frustration next spring. Think of it as giving your mower a cozy winter coat instead of leaving it exposed to the elements.
Gather Your Supplies
Before you begin, make sure you have everything on hand:
– Fuel stabilizer (like Sta-Bil or Sea Foam)
– Fresh motor oil (check your owner’s manual for the correct type and viscosity)
– Oil filter (if applicable)
– Blade sharpening kit or file
– Socket wrench set
– Grease gun and lithium-based grease
– Shop rags or paper towels
– Container for old oil/fuel disposal
– Battery charger or trickle charger (optional but recommended)
Having these ready ahead of time keeps the process smooth and avoids mid-task scrambling. Also, check local regulations—many areas require hazardous waste disposal for used oil and old fuel.
Step 1: Run the Engine Dry or Add Fuel Stabilizer
The first decision you’ll face is whether to drain the fuel tank or stabilize it. Both work, but stabilizer is often easier and less messy.
If You Choose to Drain the Fuel:
Start by running the mower until the tank is nearly empty. Then, disconnect the fuel line (usually near the carburetor) using pliers or a clamp, and catch the gas in a approved container. Never pour old gasoline down drains or onto the ground—it’s toxic and illegal in many places.
If You Use Fuel Stabilizer:
Fill the tank completely with fresh gasoline, then add the recommended amount of stabilizer according to the product label. Run the engine for 5–10 minutes to circulate the treated fuel through the carburetor and fuel lines. This seals the fuel system and prevents oxidation.
Pro tip: Always use ethanol-free gas when possible. Ethanol attracts moisture and accelerates fuel degradation.
Step 2: Change the Oil and Filter
Old oil loses its ability to lubricate effectively and may contain metal shavings or debris from normal wear. Changing it before winter removes contaminants and introduces fresh lubrication.
How to Change the Oil:
Park the mower on a flat surface, turn off the engine, and let it cool for 10–15 minutes. Place a drain pan beneath the oil drain plug (usually located at the bottom of the engine). Remove the plug and allow all oil to drain. Replace the drain plug securely.
Next, remove the oil filter (if equipped) and replace it with a new one. Apply a thin layer of fresh oil to the gasket before screwing it on fingertight plus ¾ turn.
Refill with the manufacturer-recommended amount of oil—typically between 40–60 ounces depending on model. Check the dipstick and top off as needed. Dispose of used oil responsibly at a recycling center.
Step 3: Clean the Deck and Replace or Sharpen Blades
A dirty mower deck leads to poor airflow, uneven cuts, and accelerated blade wear. Plus, leftover grass clippings create a breeding ground for rust.
Clean the Underneath:
Tilt the mower deck forward so it rests on its wheels. Use a putty knife or scraper to remove dried-on grass and mud. A garden hose works well—just avoid high-pressure sprayers that can force water into bearings.
For stubborn residue, mix warm water with dish soap and scrub gently. Dry thoroughly with a rag.
Inspect and Sharpen Blades:
Lift the deck and remove the blades using a socket wrench. Look for nicks, cracks, or excessive wear. If the edge isn’t sharp or looks bent, sharpen it with a file or grinder. Balance the blade afterward by hanging it on a nail—if it tilts evenly, it’s balanced.
Reinstall blades tightly, making sure they rotate freely. Misaligned blades cause vibration and uneven cutting.
Step 4: Lubricate All Moving Parts
Metal-on-metal contact causes friction and wear. Greasing key joints ensures smooth operation next season.
Where to Apply Grease:
– Steering wheel shaft
– Pivot points on the deck lift lever
– Deck spindles (where blades attach)
– Seat adjustment mechanisms
– Brake cables (if applicable)
Use a grease gun with a high-quality lithium-based grease. Pump grease slowly until it appears at the edges of each joint—but don’t overfill.
Step 5: Charge or Remove the Battery
Most modern riding mowers have sealed lead-acid batteries. Even if they’re maintenance-free, they still lose charge over time, especially in cold weather.
Option 1: Use a Trickle Charger
Connect the charger overnight or for several hours. This keeps the battery topped up without overcharging.
Option 2: Remove the Battery
Disconnect the negative terminal first, then the positive. Store the battery in a cool, dry place away from metal objects. Recharge it fully before reinstalling next spring.
Never store a dead battery—it shortens lifespan dramatically.
Step 6: Inflate Tires Properly
Underinflated tires develop flat spots when left stationary for long periods. Overinflated tires can crack rubber in freezing temps.
Check your owner’s manual for the correct PSI. Typically, riding mowers run between 12–18 psi. Use a tire gauge to verify, then inflate slightly above normal range (e.g., 16 psi becomes 17 psi) to account for seasonal drop.
Step 7: Store in a Dry, Covered Location
Moisture is the enemy of small engines. Always store your riding lawn mower indoors—garage, shed, basement, or even a tarp-covered outdoor shelter works if absolutely necessary.
If using a tarp, ensure airflow isn’t blocked. Never cover the mower while it’s wet—condensation will form inside and cause rust.
Troubleshooting Common Winterization Mistakes
Even experienced owners make errors. Here are frequent missteps and how to fix them:
Mistake: Skipping the oil change
Solution: Always change oil before storage. Thickened oil traps contaminants.
Mistake: Leaving old fuel in the tank
Solution: Either drain it or add stabilizer and run the engine to circulate it.
Mistake: Storing mower on concrete without protection
Solution: Use a wooden board or plastic shelf underneath to reduce moisture absorption.
Mistake: Not securing loose parts
Solution: Wrap cables and hoses loosely with tape to prevent cracking from cold.
Conclusion
Winterizing your riding lawn mower doesn’t have to be overwhelming. By dedicating a few hours now, you’ll save yourself headaches later. Follow these steps—drain or stabilize fuel, change oil, clean and sharpen blades, lubricate joints, manage the battery, and store properly—and your mower will be spring-ready with minimal fuss.
Remember: prevention beats repair. A well-maintained mower lasts longer, performs better, and gives you more value from your investment. So roll up those sleeves, grab your tools, and give your trusty riding mower the winter care it deserves. Come March, you’ll thank yourself for taking this simple but crucial step.
For more tips on maintaining your outdoor equipment, check out our guides on how to start a riding lawn mower or learn about sharpening riding lawn mower blades. And if you’re curious about depreciation, see how long your mower retains value with our article on how many years you depreciate a lawn mower.