Wisconsin planting zones & frost dates
The 5 Wisconsin cities on this site fall in zones 5b, 6a. Last spring frost dates range from Apr 27 in Racine to May 13 in Green Bay.
| City | Zone | Last frost | First frost | Population |
|---|---|---|---|---|
| Milwaukee | 6a | May 2 | Oct 12 | 563,531 |
| Madison | 5b | May 7 | Oct 3 | 285,300 |
| Green Bay | 5b | May 13 | Oct 2 | 106,311 |
| Kenosha | 5b | May 3 | Oct 14 | 99,578 |
| Racine | 6a | Apr 27 | Oct 18 | 78,057 |
Frost dates are 30%-risk dates from the nearest suitable NOAA station. Population: Census Vintage 2024 estimates.