Washington frost dates by city
| City | Last frost (50%) | Safer date (10%) | First frost (50%) | Season |
|---|---|---|---|---|
| Seattle | Mar 2 | Mar 23 | Nov 23 | 266 days |
| Spokane | Apr 26 | May 10 | Oct 12 | 168 days |
| Yakima | May 8 | May 27 | Oct 4 | 149 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.