Frost dates across Wisconsin
Typical last spring frost, first fall frost, and USDA zone for 11 Wisconsin cities, from 30-year NOAA climate normals. Every date is a 50 percent odds line, not a promise. Pick a city for the full frost window and what is plantable there now.
Not on the list? Any Wisconsin ZIP works.
| City | Last spring frost | First fall frost | Season length | Zone |
|---|---|---|---|---|
| Milwaukee | Apr 26 | Oct 22 | about 179 days | 6a |
| Madison | May 1 | Oct 9 | about 161 days | 5b |
| Green Bay | Apr 30 | Oct 9 | about 162 days | 5b |
| Kenosha | Apr 19 | Oct 26 | about 190 days | 6a |
| Eau Claire | Apr 24 | Oct 14 | about 173 days | 4b |
| La Crosse | Apr 23 | Oct 17 | about 177 days | 5a |
| Fond Du Lac | May 1 | Oct 12 | about 164 days | 5b |
| Wausau | May 6 | Oct 4 | about 151 days | 4b |
| Superior | May 6 | Oct 9 | about 156 days | 4b |
| River Falls | May 11 | Oct 1 | about 143 days | 4b |
| Platteville | Apr 30 | Oct 13 | about 166 days | 5a |
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