Wisconsin frost dates by city
| City | Last frost (50%) | Safer date (10%) | First frost (50%) | Season |
|---|---|---|---|---|
| Green Bay | Apr 30 | May 16 | Oct 9 | 161 days |
| Madison | May 1 | May 16 | Oct 10 | 160 days |
| Milwaukee | Apr 19 | May 2 | Oct 29 | 192 days |
Each city uses its nearest major NOAA weather station, usually the airport. Valleys, hilltops and rural spots can differ from it by one to three weeks. How to read these dates.