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Washington frost dates
Across the 33Washington weather stations below, the average last spring frost ranges from Mar 2 in Seattle Tacoma to May 30 in Spokane 17 Ssw. The statewide middle is about Apr 11 for the last spring frost and Oct 25 for the first fall frost. Seattle Tacoma has the longest growing season, about 266 days. Hardiness zones in these places: 6b, 7a, 7b, 8a, 8b, 9a.
Frost dates by city
| Place | Zone | Last spring frost | 90% safe after | First fall frost | Frost-free days |
|---|---|---|---|---|---|
| Seattle Tacoma | 9a | Mar 2 | Mar 23 | Nov 23 | 266 |
| Seattle Sand Pt | 9a | Mar 8 | Mar 29 | Nov 23 | 260 |
| Everett Snohomish | 8b | Mar 9 | Mar 29 | Nov 17 | 253 |
| Tacoma Narrows | 9a | Mar 11 | Apr 2 | Nov 21 | 255 |
| Renton | 9a | Mar 13 | Mar 31 | Nov 16 | 248 |
| Seattle Boeing | 9a | Mar 13 | Apr 1 | Nov 17 | 249 |
| Whidbey Island | 8b | Mar 13 | Apr 1 | Nov 14 | 246 |
| Friday Harbor | 9a | Mar 26 | Apr 21 | Nov 10 | 229 |
| Walla Walla | 7a | Mar 27 | Apr 22 | Oct 31 | 218 |
| Vancouver Pearson | 8b | Mar 29 | Apr 18 | Nov 9 | 225 |
| Hoquiam Bowerman | 8b | Mar 30 | Apr 25 | Nov 14 | 229 |
| Bellingham | 8b | Mar 31 | Apr 18 | Oct 30 | 213 |
| Toledo Faa | 8a | Apr 5 | May 4 | Oct 25 | 203 |
| Quinault 4 Ne | 8b | Apr 7 | May 6 | Nov 10 | 217 |
| Port Angeles | 8b | Apr 8 | May 1 | Oct 31 | 206 |
| Wenatchee Pangborn | 7a | Apr 8 | Apr 23 | Oct 24 | 199 |
| The Dalles | 8a | Apr 11 | Apr 28 | Oct 26 | 198 |
| Darrington 21 Nne | 8a | Apr 16 | May 6 | Oct 25 | 192 |
| Quillayute | 9a | Apr 20 | May 10 | Oct 26 | 189 |
| Ephrata | 6b | Apr 22 | May 6 | Oct 17 | 178 |
| Spokane | 6b | Apr 26 | May 10 | Oct 12 | 169 |
| Spokane Felts | 7a | Apr 26 | May 10 | Oct 15 | 172 |
| Moses Lake Grant | 7a | Apr 27 | May 11 | Oct 8 | 164 |
| Pasco Tri Cities | 7b | Apr 27 | May 10 | Oct 11 | 167 |
| Shelton Sanderson | 8b | Apr 27 | May 12 | Oct 16 | 172 |
| Ellensburg Bowers | 6b | Apr 28 | May 12 | Oct 7 | 162 |
| Olympia | 8a | Apr 29 | May 15 | Oct 14 | 168 |
| Pullman Moscow | 6b | Apr 29 | May 14 | Oct 2 | 156 |
| Omak | 6b | Apr 30 | May 15 | Oct 7 | 160 |
| Yakima Air Terminal | 7a | May 8 | May 27 | Oct 4 | 149 |
| Stampede Pass | 7a | May 14 | Jun 5 | Oct 17 | 156 |
| Deer Park | 6b | May 22 | Jun 15 | Sep 14 | 115 |
| Spokane 17 Ssw | 6b | May 30 | Jul 13 | Sep 4 | 97 |
Dates are the 50% probability of a 32°F freeze (NOAA 1991–2020 normals); "90% safe after" is the date after which a later spring freeze happens in only 1 year in 10.
When to plant in Washington
Using the statewide middle dates (last frost Apr 11, first frost Oct 25). Adjust for your town with the table above or the planting calendar.
| Plant | When to plant in Washington |
|---|---|
| Tomatoes | Apr 18 – May 2 |
| Peas | Feb 28 – Mar 21; fall: Aug 2 – Aug 23 |
| Potatoes | Mar 14 – Apr 4 |
| Green beans | Apr 18 – May 2; fall: Aug 9 – Aug 23 |
| Garlic | Oct 25 – Nov 22 |
| Tulips | Oct 11 – Nov 22 |