Washington planting zones & frost dates
The 18 Washington cities on this site fall in zones 6b, 7a, 7b, 8a, 8b, 9a. Last spring frost dates range from Mar 16 in Seattle to May 2 in Pasco.
| City | Zone | Last frost | First frost | Population |
|---|---|---|---|---|
| Seattle | 9a | Mar 16 | Nov 15 | 780,995 |
| Spokane | 6b | May 1 | Oct 7 | 230,609 |
| Tacoma | 8b | Mar 17 | Nov 7 | 228,202 |
| Vancouver | 8b | May 1 | Oct 10 | 198,992 |
| Bellevue | 8b | Mar 16 | Nov 15 | 154,377 |
| Kent | 8b | Mar 29 | Nov 3 | 136,588 |
| Everett | 8b | Apr 1 | Oct 27 | 113,011 |
| Spokane Valley | 7a | May 1 | Oct 7 | 108,267 |
| Renton | 9a | Mar 22 | Nov 7 | 105,543 |
| Federal Way | 8b | Mar 17 | Nov 7 | 100,252 |
| Yakima | 7a | Apr 18 | Oct 17 | 97,390 |
| Bellingham | 8a | Apr 8 | Oct 26 | 95,860 |
| Kirkland | 9a | Mar 16 | Nov 15 | 95,499 |
| Kennewick | 7b | Apr 2 | Oct 25 | 86,728 |
| Auburn | 8b | Mar 29 | Nov 3 | 85,513 |
| Redmond | 8b | Mar 16 | Nov 15 | 82,195 |
| Pasco | 7a | May 2 | Oct 4 | 81,724 |
| Marysville | 8b | Apr 1 | Oct 27 | 76,209 |
Frost dates are 30%-risk dates from the nearest suitable NOAA station. Population: Census Vintage 2024 estimates.