Michigan frost dates by city
| City | Last frost (50%) | Safer date (10%) | First frost (50%) | Season |
|---|---|---|---|---|
| Detroit | Apr 20 | May 8 | Oct 27 | 188 days |
| Grand Rapids | Apr 29 | May 15 | Oct 20 | 174 days |
| Lansing | May 1 | May 18 | Oct 13 | 162 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.