Get a step-by-step winterization checklist tailored to your boat type and climate. Includes cost estimates for DIY and professional service.
Get a personalized winterization checklist with estimated costs for your boat
Select your engine type and storage method to get a custom checklist of winterization steps. Covers all critical systems: engine, fuel, plumbing, electrical, and exterior protection.
Each step includes cost estimates for both DIY and professional winterization, so you can decide what to tackle yourself and what to leave to the pros.
Water expands by about 9% when it freezes. Trapped water in your engine, cooling system, or plumbing can crack castings and burst hoses—damage that can cost thousands to repair.
Proper winterization protects your investment and is rarely covered by insurance if skipped. It’s the most important off-season maintenance you can do.
Skipping winterization is one of the most expensive mistakes a boat owner can make. Freezing water can:
A $200–$400 winterization can prevent thousands in damage.
Every checklist should include:
Inboards typically cost 30–50% more to winterize.
Tip: DIY the easy stuff (cleaning, fuel stabilizer) and hire a pro for engine/mechanical work.
Wash the boat, clean the bilge, remove perishables and valuables. Dry life jackets, cushions, and canvas to prevent mold and pests.
Fog the engine, change oil, drain or fill cooling system with antifreeze, stabilize fuel, and grease all fittings. Always follow your engine manufacturer’s winterization procedure.
Drain all water, add antifreeze to plumbing, pump bilge dry, and remove or maintain batteries. Cover the boat with a breathable cover to prevent mold.
Winterize before the first hard freeze (below 32°F). In northern states, this is usually late October to early November. Don’t wait—shops fill up fast.
Professional winterization costs $200–$500 for most boats. DIY costs $50–$150 in materials. Larger or more complex boats cost more.
Yes, especially for outboards. You’ll need fogging oil, fuel stabilizer, antifreeze, and basic tools. Inboards are more complex—consider a pro if unsure.
Heated storage above 40°F reduces but doesn’t eliminate winterization needs. Still stabilize fuel, change oil, and maintain batteries.
Water left in the engine or plumbing can freeze and expand, causing cracks and major repairs ($3,000–$10,000+). Unstabilized fuel can gum up the system.
Run engine with stabilized fuel, fog through carburetor or spark plug holes, change lower unit gear oil, grease fittings, and disconnect battery.
Yes, fill the tank and add stabilizer to prevent condensation and ethanol separation.
Drain all tanks and lines, then pump non-toxic antifreeze through all fixtures until pink comes out. Don’t forget the water heater and livewell.
Yes—store batteries in a climate-controlled space on a trickle charger or maintainer.
Use -50°F non-toxic propylene glycol (pink RV/marine antifreeze) for plumbing. Use manufacturer-recommended antifreeze for engine cooling systems.
If you run a fogged engine, you’ll need to re-winterize. Wait until after your last trip to winterize.
Not recommended in freezing climates. Use a de-icer/bubbler, heated engine compartment, and monitor constantly. Hauling out is safer and often required by insurance.
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Reviewed by Premium Boatcare Team