Iowa frost dates by city
| City | Last frost (50%) | Safer date (10%) | First frost (50%) | Season |
|---|---|---|---|---|
| Cedar Rapids | Apr 27 | May 11 | Oct 11 | 165 days |
| Des Moines | Apr 18 | May 2 | Oct 20 | 184 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.