Minnesota frost dates by city
| City | Last frost (50%) | Safer date (10%) | First frost (50%) | Season |
|---|---|---|---|---|
| Duluth | May 13 | May 29 | Oct 1 | 140 days |
| Minneapolis | Apr 23 | May 7 | Oct 18 | 176 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.