Washington · 65 stations
Washington Frost Dates: 65 Weather Stations
65 NOAA weather stations in Washington with at least 25 years of frost records.
| Station | Zone | Last spring frost (50%) | First fall frost (50%) | Frost-free days |
|---|---|---|---|---|
| Aberdeen, WA | 9a | March 29 | November 15 | 234 |
| Battle Ground, WA | 8b | April 26 | October 16 | 174 |
| Bellingham (Airport), WA | 8b | March 31 | October 30 | 211 |
| Boundary Dam, WA | 6a | May 4 | October 4 | 153 |
| Chelan, WA | 7b | April 17 | October 22 | 187 |
| Chewelah, WA | 6a | May 16 | September 15 | 120 |
| Clearbrook, WA | 8a | April 18 | October 18 | 185 |
| Concrete PPL Fish Station, WA | 8b | March 28 | November 14 | 229 |
| Cougar, WA | 8b | April 1 | November 18 | 227 |
| Coulee Dam, WA | 7a | April 22 | October 21 | 180 |
| Coupeville, WA | 8b | March 17 | November 11 | 237 |
| Cushman Powerhouse #2, WA | 9a | March 24 | November 15 | 235 |
| Davenport, WA | 6b | June 6 | September 11 | 94 |
| Dayton, WA | 7a | April 28 | October 13 | 168 |
| Diablo Dam, WA | 8a | April 10 | November 1 | 203 |
| Elma, WA | 8b | May 1 | October 14 | 169 |
| Ephrata, WA | 7a | April 22 | October 17 | 175 |
| Everett, WA | 8b | March 24 | November 2 | 223 |
| Forks, WA | 8b | April 26 | October 25 | 182 |
| Humptulips Salmon Hatchery, WA | 8b | April 26 | October 22 | 180 |
| Kennewick, WA | 7b | March 28 | October 30 | 216 |
| Kent, WA | 9a | March 20 | November 10 | 233 |
| Lacrosse, WA | 6b | May 13 | September 26 | 133 |
| Long Beach, WA | 9a | April 6 | October 26 | 200 |
| Longview, WA | 8b | April 8 | November 5 | 210 |
| Mazama, WA | 5b | May 9 | September 29 | 142 |
| Newhalem, WA | 8b | April 2 | November 14 | 224 |
| Northport, WA | 6b | May 8 | October 1 | 143 |
| Odessa, WA | 6b | May 14 | September 26 | 135 |
| Olympia, WA | 8a | April 29 | October 14 | 169 |
| Packwood, WA | 8a | April 30 | October 8 | 162 |
| Palmer, WA | 8b | April 3 | November 11 | 219 |
| Plain, WA | 6b | May 22 | September 22 | 121 |
| Pullman, WA | 6b | May 6 | September 29 | 143 |
| Quillayute State Airport, WA | 9a | April 20 | October 26 | 190 |
| Raymond, WA | 8b | April 26 | October 17 | 177 |
| Republic, WA | 6a | May 30 | September 10 | 102 |
| Richland, WA | 7b | April 6 | October 24 | 200 |
| Ritzville, WA | 6b | May 7 | October 10 | 153 |
| Ross Dam, WA | 7b | April 8 | November 10 | 214 |
| Seattle (Seattle-Tacoma Airport), WA | 9a | March 2 | November 23 | 266 |
| Sequim, WA | 8b | April 21 | October 20 | 181 |
| Spokane, WA | 6b | April 26 | October 12 | 168 |
| St. John, WA | 7a | April 29 | October 4 | 161 |
| Startup, WA | 8b | April 15 | October 25 | 192 |
| Stehekin, WA | 7b | April 27 | October 17 | 173 |
| Upper Baker Dam, WA | 8a | April 24 | October 29 | 190 |
| Vancouver, WA | 8b | April 26 | October 18 | 177 |
| Walla Walla, WA | 7b | March 27 | October 31 | 219 |
| Wenatchee, WA | 7b | April 4 | October 28 | 208 |
| Wenatchee (Pangborn Airport), WA | 7a | April 8 | October 24 | 200 |
| Whitman Mission, WA | 7a | May 2 | October 1 | 151 |
| Wilbur, WA | 6b | June 1 | September 22 | 112 |
| Winthrop, WA | 5b | May 15 | September 22 | 127 |
| Yakima, WA | 7a | May 8 | October 4 | 149 |
| near Bellingham, WA | 8b | April 1 | November 2 | 216 |
| near Bridgeport, WA | 7a | April 26 | October 11 | 167 |
| near Burbank, WA | 7b | April 7 | October 22 | 199 |
| near Carson, WA | 8a | May 2 | October 9 | 161 |
| near Dallesport, WA | 8a | April 11 | October 26 | 197 |
| near Entiat, WA | 7a | April 5 | October 24 | 200 |
| near Hoquiam, WA | 9a | March 30 | November 14 | 228 |
| near Kirkland, WA | 9a | March 8 | November 23 | 259 |
| near Tacoma, WA | 9a | March 8 | November 14 | 250 |
| near Wilderness Rim, WA | 8b | April 23 | November 1 | 193 |