How to Winterize a Jet Ski (and When to Do It Before Winter)
The season's winding down, and the clock is officially ticking. Winterizing your jet ski isn't the fun part of ownership — but it's the part that decides whether spring starts with a first pull or a repair bill. Here's exactly what to do and when to do it.
When should you winterize your jet ski?
The rule that works no matter where you ride: winterize before the first hard freeze. Once your overnight lows start creeping toward 32°, any water left sitting in your engine or cooling passages can freeze, expand, and crack expensive components. That's the trigger to watch — not a date on the calendar.
When that freeze actually shows up depends on where you are. For most riders, it lands somewhere between late September up north and late October further south — here in Ohio, we're usually looking at October. Wherever you fall on that map, the move is the same: don't wait for the first frost to remind you. Plan for it.
And if your riding season is already over, there's no reason to wait at all. The sooner it's stored properly, the less that trapped moisture and old fuel have a chance to do damage.
What happens if you don't winterize your PWC?
Skipping winterization is one of the most expensive shortcuts in powersports. Left untreated over a cold Ohio winter, you're risking:
- Cracked engine components or exhaust from frozen water
- Gummed-up fuel systems and clogged injectors from stale gas
- A dead battery you'll be replacing in spring
- Corrosion on internal engine parts left unprotected
None of these are cheap. All of them are avoidable.
How to winterize a jet ski, step by step
You can absolutely do this yourself in an afternoon. Here's the general process — always check your owner's manual for your specific model.
- Stabilize the fuel. Fill the tank and add a fuel stabilizer, then run the engine briefly, so treated fuel circulates through the system. A full, stabilized tank resists condensation and keeps fuel from breaking down.
- Flush the system. Flush the engine with fresh water per your manual to clear out any residue, salt, or debris from the season.
- Fog the engine. Fogging oil coats internal engine parts with a protective film that fights corrosion all winter. This is the step most people skip and most regret.
- Handle the battery. Disconnect it, store it somewhere that won't freeze, and keep it topped off with a battery tender so it's ready to go in spring.
- Lube and protect. Hit fittings, cables, and seals with the appropriate grease and corrosion protectant.
- Cover and store. Get it up on a stand if you can, and cover it with a fitted PWC cover to keep dust, moisture, and pests out.
Do you still need to winterize if it's stored in a garage?
Yes. An unheated garage in Ohio still gets cold enough to freeze trapped water, and garage storage does nothing for stale fuel or a slowly draining battery. Indoor storage is better than outdoor — but it's not a substitute for winterizing.
Get everything you need in one place
From fuel stabilizer and fogging oil to battery tenders, covers, and storage stands, we carry the winterization essentials to get your PWC put away right. Shop our watersports and PWC category and knock it out this weekend — before the forecast makes the decision for you.
Because the off-season is just the setup for the next one. Always Moving You Forward.
