Michigan Boat Winterization Checklist (And What Your Insurance Policy Requires)

Up here on the water — whether you're keeping a boat on Walloon Lake, Grand Traverse Bay, or the Thunder Bay River in Alpena — the end of boating season sneaks up on you every single year. One week you're out for a sunset cruise, and the next week there's frost on the windshield and you're wondering where October went.

We get a version of the same question every fall: "Does my insurance still cover my boat once it's out of the water?" The honest answer is: sometimes — but only if you've done your part. Michigan's own Department of Natural Resources puts it plainly in its fall boating bulletin: your insurance policy may not cover damage due to lack of maintenance. That's not a scare tactic. It's just how most watercraft policies are written, and it's worth understanding before the first hard freeze, not after a claim gets denied.

Short answer: Boat insurance doesn't automatically "pause" for winter, and homeowners insurance usually doesn't pick up the slack. Damage from fire, theft, or freezing while your boat sits in off-season storage may not be covered unless you have a dedicated watercraft policy — and even then, coverage can hinge on whether you properly winterized. October is the window to get it right.

Does my insurance coverage "pause" for the winter?

No — and this is the assumption that trips up more boat owners than anything else. Your policy keeps running through the off-season unless you cancel it, and there are good reasons not to. Many marinas and lienholders actually require continuous coverage as a condition of storage or financing. On top of that, your boat is arguably at more risk sitting in storage than out on the water: off-season theft and vandalism, falling trees and ice damage, and weather exposure don't take the winter off just because you do.

Will my homeowners policy cover my boat while it's in storage?

Usually not the way people assume. A standard homeowners policy generally does not cover a boat sitting in storage, and damage from fire or theft is often excluded entirely without a separate watercraft policy. There's a small exception: some smaller, lower-powered boats may pick up limited coverage under a homeowners or renters policy. But larger boats, faster boats, and personal watercraft (think jet skis) typically need their own dedicated policy — storage season or not.

What does "damage due to lack of maintenance" actually mean?

This is the line that catches people off guard. Insurers write policies expecting you to take reasonable care of your boat — that includes properly winterizing it. If you skip winterization (or do it halfway) and something fails because of it — a cracked engine block from water that was never drained, for example — that's treated as a maintenance issue, not a covered loss. The fix isn't complicated: do the work, and keep a record that you did it.

What's on a proper Michigan boat winterization checklist?

Every boat and motor is a little different, so your owner's manual should always be your first stop. But across the board, a solid winterization checklist covers:

• Engine: Flush with fresh water, drain carburetor fuel, and use fogging oil in the cylinders, following the manufacturer's instructions.
• Stern drive: Inspect the lower unit, remove any growth or barnacles, drain the gear case, and give it a proper cleaning.
• Fuel tank: Fill it to limit condensation and add a fuel stabilizer.
• Freshwater system: Drain the tank and water heater, then run nontoxic antifreeze through the faucets and raw water system.
• Battery: Remove it or keep it properly maintained through the winter.
• Interior: Clear out valuables, clean drawers and the fridge, and prop cushions up on edge for airflow.
• Storage: Indoor, climate-controlled storage is the gold standard, but it isn't cheap. Shrink-wrapping or a sturdy, well-fitted cover is a reasonable next-best option.
• Keep your receipts. If a marina or technician winterizes your boat, hang onto that paperwork. If you do it yourself, snap a few photos. It's the easiest way to show an insurer the work was actually done.

Should I consider ice and freeze coverage?

It's worth a conversation with your agent. Ice and freeze coverage is typically offered as an inexpensive add-on, but there's a catch: many insurers stop offering it once temperatures drop, often around the end of October. Some carriers will only honor a freeze-damage claim if the boat was professionally winterized — another reason those receipts matter. If you've been putting off that call, October is genuinely the month to make it, not November.

A few easy ways to lower your premium while you're at it

Since you're already thinking about your policy this time of year, it's worth asking your agent about a few things that can bring your premium down: completing a boating safety course, raising your deductible if you're comfortable with more out-of-pocket risk, and bundling your boat policy with your home or auto coverage. None of these take long to ask about, and they can add up.

A note to our neighbors on the water

Petoskey, Traverse City, and Alpena are consistently among the communities with the highest boat ownership per capita in Michigan — which means this isn't an abstract topic for a lot of our clients, it's a fall ritual. If your boat is heading into storage this month, take ten minutes to check that your coverage actually matches how and where it's being stored. We're always happy to do that check with you.

Frequently asked questions

Does my boat insurance cover me in the winter if I don't winterize it?
Not reliably. If damage is tied to a lack of proper maintenance, insurers can deny the claim. Winterizing your boat and keeping documentation protects your coverage, not just your engine.

Is my boat covered under my homeowners policy while it's in storage?
Generally, no. Homeowners policies typically exclude boats in storage, especially for fire and theft. Small, low-powered boats may have limited coverage, but most boats need a dedicated watercraft policy.

When should I winterize my boat in Michigan?
October, before the first hard freeze. It's also roughly when ice and freeze coverage enrollment windows start closing with many insurers.

Should I keep my boat insured even when I'm not using it?
Yes. Marinas and lienholders often require it, and theft, vandalism, and weather risk don't disappear in the off-season.

What is ice and freeze coverage?
An optional add-on that helps cover freeze-related damage. It's usually inexpensive, but enrollment windows often close by late October, so it's worth asking about early.

Let's make sure your boat is ready for storage season

Winterizing your boat protects your engine. Reviewing your coverage protects your wallet. Both take less time than you'd think, and we're here to help with either one — just give us a call at 800-686-8664 or request a quote to have your watercraft coverage checked before the water freezes over. You can also learn more on our boat insurance page.

This article is for general educational purposes and is not legal or insurance advice. Coverage always depends on the terms, conditions, and exclusions of your specific policy, and nothing in this article is bound until confirmed by an authorized Top O' Michigan representative, subject to underwriting.

Sources & further reading:

• Michigan DNR — "Fall Means Winterize and Plan!" (Explore MI Boating) — https://content.govdelivery.com/accounts/MIDNR/bulletins/20fd9cf
• Meemic Insurance — "Protect Your Boat with Insurance, Winterization" — https://www.meemic.com/why-meemic/blog/claims-safety/winterize-your-boat