FrostList

Boat Winterization in Wisconsin

In Wisconsin, local boat deadlines run from Oct 9 to Oct 30, with a median around Oct 19 — a spread of weeks that a single statewide date would miss. Find your city below; each links to local freeze odds, a live 10-day outlook, and a checklist.

Covered boat locked in ice beside a dock on a frozen lake — winterize the engine before the first hard freeze catches it in the water — Wisconsin deadlines city by city
Photo: Unsplash

Notable cities

All Wisconsin cities

CityLocal deadlineMedian first 28°F
WausauOct 9Oct 16View →Checklist
AppletonOct 11Oct 18View →Checklist
MadisonOct 13Oct 20View →Checklist
WaukeshaOct 16Oct 23View →Checklist
BeloitOct 16Oct 23View →Checklist
New BerlinOct 17Oct 24View →Checklist
GreenfieldOct 17Oct 24View →Checklist
Green BayOct 18Oct 25View →Checklist
La CrosseOct 18Oct 25View →Checklist
BrookfieldOct 18Oct 25View →Checklist
Eau ClaireOct 19Oct 26View →Checklist
JanesvilleOct 19Oct 26View →Checklist
WauwatosaOct 23Oct 30View →Checklist
OshkoshOct 24Oct 31View →Checklist
Fond du LacOct 24Oct 31View →Checklist
MilwaukeeOct 25Nov 1View →Checklist
West AllisOct 25Nov 1View →Checklist
SheboyganOct 25Nov 1View →Checklist
RacineOct 27Nov 3View →Checklist
KenoshaOct 30Nov 6View →Checklist
OctNovWausauOct 9AppletonOct 11MadisonOct 13WaukeshaOct 16BeloitOct 16New BerlinOct 17GreenfieldOct 17Green BayOct 18La CrosseOct 18BrookfieldOct 18Eau ClaireOct 19JanesvilleOct 19WauwatosaOct 23OshkoshOct 24Fond du LacOct 24MilwaukeeOct 25West AllisOct 25SheboyganOct 25

Local boat winterization deadlines for Wisconsin cities — built from each city’s own NOAA station, not one statewide date.

Boat Winterization in Wisconsin: related searches

Wisconsin homeowners search for: how to winterize a boat, winterize outboard motor, and "boat winterization near me" — every city page below answers those with local NOAA dates.

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Back to the national Boat Winterization guide, or see the methodology. You can also compare how the boat winterization window shifts in West Virginia and Wyoming.

Data: NOAA NCEI 1991–2020 U.S. Climate Normals; live outlook by Open-Meteo. Last updated: July 25, 2026.