How to Winterize Your ATV or Mower

Kentucky winters aren't the harshest in the country, but they're wet, they freeze, and they're long enough to wreck a stored engine. Cold air and damp barns do three things to small engines: they gum up fuel systems, drain batteries, and corrode whatever they touch. Machines that get put away without a plan in November are the ones that need carburetor work in March.

The good news: winterization is one of the easiest, cheapest maintenance jobs there is. It takes an afternoon, costs a few dollars in supplies, and it's the single highest-return hour of work you'll do all year. Here's the full routine, laid out for both mowers and ATVs.

The Golden Rule: Fuel

Old fuel is the #1 cause of spring no-starts, full stop. Modern gasoline — especially the ethanol-blended fuel common at Kentucky pumps — absorbs moisture and breaks down into varnish and gum in as little as a few months. That gum coats the inside of your carburetor, and by March the jets are plugged solid.

You have two good options:

• Stabilize and run. Add a fuel stabilizer to a mostly-full tank, then run the engine for five to ten minutes so treated fuel reaches the carburetor. A full tank also limits condensation inside the tank over the winter.
• Drain it completely. Drain the tank and then run the engine dry so the carburetor bowl empties too. This is the more thorough option for machines that will sit six months or more.

Which one is better? For mowers that see light spring use, stabilize-and-run is usually plenty. For ATVs that might sit until April, draining is the safer play. Either way, don't leave untreated gas in the tank and call it done — that's exactly the mistake that pays for our spring carburetor work.

Change the Oil Before Storage

Oil that has run a season is acidic and loaded with combustion byproducts. Sitting in a cold engine all winter gives those acids months to work on bearings and cylinder walls. Changing the oil at the end of the season means the engine sits with fresh, clean oil protecting it instead of old, corrosive oil attacking it.

Do this with a warm engine — run it for a few minutes first so the oil flows out fast and carries more contaminants with it. Use the viscosity your owner's manual specifies, and you're done. It's the same job you'd do in the spring, but doing it in the fall does double duty.

Battery: Cold Is the Enemy

Cold temperatures slow the chemical reaction inside a battery, which is why a battery that struggled in October is dead by January. A fully charged battery is also far less likely to freeze than a discharged one.

• Disconnect it. Pull the negative cable first. A tiny parasitic drain (clock, ECU, alarm) can kill a battery in weeks of sitting.
• Store it charged. Put it on a maintenance charger or "battery tender" for the winter, or top it off monthly with a regular charger.
• Store it somewhere above freezing if you can — a garage corner beats an unheated barn.

The old advice about never setting a battery on concrete is largely outdated — modern sealed batteries are fine on a shelf or bench. What matters is that it's charged and not drained by the machine.

Clean Everything First

Grass clippings, mud, and trail dirt are moisture magnets. A machine put away dirty will sit in damp contact with that junk all winter, which means rust, stuck cables, and corroded connections come spring.

• Wash it down and let it dry completely before covering.
• Scrape the mower deck — packed grass rusts decks from the inside out.
• Lube cables and pivot points so nothing seizes over the winter.
• Wipe down metal surfaces with a light coat of oil or rust preventive where practical.

Mower-Specific Checklist

• Blades: pull them off now and sharpen them over the winter — you'll be ahead of the spring rush, and a spare set can be done while the originals are on the machine.
• Belts: inspect drive and deck belts for cracks and fraying while the machine is off. Replacing them in the winter is cheaper and easier than a snapped deck belt in April.
• Tires: air them up to spec and park on boards or a dry floor. Flat spots from sitting all winter are a real thing.
• Spark plug: pull, inspect, and replace if worn — or at least clean and re-gap it.

ATV-Specific Checklist

• Coolant: check the level and, if it's due, replace the antifreeze. Kentucky winters can catch a weak mix off guard.
• Chain: clean, lube, and check tension. A dry chain will rust over winter, and a rusty chain is a spring replacement.
• Tires: check pressure and store the machine on a stand or boards so the tires don't develop flat spots.
• Brake fluid: check the level and inspect pads. Winter moisture is brutal on brake systems.
• Rodents: this sounds odd until it happens to you. Mice love nesting in airboxes and under seats, and they chew wiring. Check your airbox intake, and consider a trap or deterrent in the storage area.
• Cover it with a breathable cover — not a plastic tarp, which traps condensation.

At-a-Glance Checklist

Task	Mower	ATV
Fuel	Stabilize & run, or drain	Drain, or stabilize & run
Oil	Change before storage	Change before storage
Battery	Disconnect, maintain charge	Disconnect, maintain charge
Clean	Scrape deck, wash, lube	Wash, lube chain, clean airbox
Extra	Sharpen blades, check belts	Check coolant, tires off ground
Store	Dry shed, covered, off ground	Breathable cover, rodent-checked

Winterization FAQ

Is fuel stabilizer really necessary?
If the machine will sit more than a few weeks, yes. Ethanol-blended fuel absorbs moisture and gums up carburetors — stabilizer slows that process, and draining the system stops it entirely.

Should I run the engine during the winter?
No. Idling a cold engine for a few minutes in January does more harm than good — it never reaches operating temperature, so moisture condenses inside. Winterize it and leave it alone until spring.

Can Turf & Trail winterize my machine?
Yes — we offer full winterization service for mowers, zero turns, and ATVs at our Richmond, KY shop, with pickup and delivery available across Berea, Waco, Kirksville, and the Madison County area. Call (859) 661-8877 to book a spot.