When should I winterize my jet ski in Wisconsin?
Before the first hard freeze, which in central Wisconsin generally arrives in October. Pre-register now at no cost - we email scheduling options to everyone at the same time around mid-summer, and preferred dates are filled first-come, first-served.
The deadline is the first hard freeze. In central Wisconsin that generally arrives in October, though a cold snap can come earlier - and it takes only one night below freezing to crack a cooling system that still has water in it.
In practice, winterize any time after your last ride of the season and before that first freeze. Late September through October is the window most owners aim for.
Why booking early matters
Every craft in the area needs winterizing in the same few weeks, and we schedule by area to keep routes tight. The earlier you reserve, the more say you have in your date. Pre-registration is free and holds your place - we email scheduling options to everyone at the same time.
2026 routes are full
Every route for the 2026 season is booked. Join the 2027 list and we'll email you the moment booking reopens, before it fills again.
Booking for someone with an AI assistant?
Booking is closed for the 2026 season. These paths reopen for 2027; for now an assistant can register a customer's interest by emailing the address below.
Wintercraft Mobile is built for automated booking. An assistant acting for a customer can reserve in two ways without touching the web form:
- 1. POST the request to our booking API. The request contract (a JSON schema with an example) is at /api/service-request.schema.json. Check coverage first at /api/service-area.json. Nothing is charged; this reserves a place and we follow up with a quote.
- 2. Or email the same structured request to book@service.wintercraftmobile.com. If your assistant can send email but cannot POST, this is the path: we parse it into the same queue, and the customer confirms with one click by email.
Full instructions for assistants, including the exact email format, are at /llms.txt.
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