Washington frost dates
Across 154 weather stations in Washington, the median last spring frost runs from Feb 26 in Olga to Jun 6 in Davenport, and the first fall frost from Sep 4 to Nov 29.
Washington at a glance
- Weather stations
- 154
- Earliest last frost
- Feb 26 Olga
- Latest last frost
- Jun 6 Davenport
- Longest season
- 276 days Olga
- Typical season
- about 180 frost-free days
- Hardiness zones
- Zones 6a to 9a
Frost dates by weather station
| Weather station | Last spring frost | First fall frost | Frost-free days | Zone |
|---|---|---|---|---|
| Aberdeen | Mar 29 | Nov 15 | 234 | 8b |
| Aberdeen 20 mi NNE | Apr 15 | Nov 2 | 200 | 8b |
| Anacortes | Mar 8 | Nov 20 | 255 | 8b |
| Arlington | Apr 22 | Oct 19 | 181 | 8b |
| Baring | Apr 14 | Oct 29 | 197 | 8a |
| Battle Ground | Apr 26 | Oct 16 | 174 | 8b |
| Bellingham | Apr 1 | Nov 2 | 216 | 8b |
| Bellingham International Airport | Mar 31 | Oct 30 | 211 | 8b |
| Bickleton | May 16 | Oct 9 | 144 | 7b |
| Blaine | Mar 31 | Nov 4 | 219 | 8b |
| Boundary Dam | May 4 | Oct 4 | 153 | 6a |
| Bremerton | Mar 29 | Nov 14 | 227 | 9a |
| Buckley | Apr 7 | Oct 30 | 204 | 8b |
| Carson Fish Hatchery | May 2 | Oct 9 | 161 | 8a |
| Cedar Lake | Apr 23 | Nov 1 | 193 | 8a |
| Centralia | Apr 22 | Oct 27 | 188 | 8b |
| Chelan | Apr 17 | Oct 22 | 187 | 7b |
| Chewelah | May 16 | Sep 15 | 120 | 6a |
| Chief Joseph Dam | Apr 26 | Oct 11 | 167 | 7a |
| Cle Elum | May 13 | Sep 25 | 132 | 7a |
| Clearbrook | Apr 18 | Oct 18 | 185 | 8a |
| Clearwater | Apr 29 | Oct 17 | 171 | 8b |
| Colville | May 2 | Oct 2 | 153 | 6a |
| Concrete Ppl Fish Station | Mar 28 | Nov 14 | 229 | 8a |
| Connell | Apr 30 | Oct 12 | 165 | 7a |
| Cougar | Apr 1 | Nov 18 | 227 | 8a |
| Coulee Dam | Apr 22 | Oct 21 | 180 | 7b |
| Coupeville | Mar 17 | Nov 11 | 237 | 8b |
| Cushman Powerhouse | Mar 24 | Nov 15 | 235 | 8b |
| Darrington | Apr 16 | Oct 25 | 192 | 8a |
| Darrington Ranger Station | Apr 16 | Oct 23 | 190 | 8a |
| Davenport | Jun 6 | Sep 11 | 94 | 6b |
| Dayton | Apr 28 | Oct 13 | 168 | 7a |
| Deer Park Airport | May 22 | Sep 14 | 112 | 6b |
| Diablo Dam | Apr 10 | Nov 1 | 203 | 7a |
| Easton | May 9 | Oct 6 | 151 | 7a |
| Ellensburg | May 8 | Oct 2 | 146 | 6b |
| Ellensburg Bowers Field | Apr 28 | Oct 7 | 163 | 6b |
| Elma | May 1 | Oct 14 | 169 | 8b |
| Eltopia | Apr 21 | Oct 22 | 182 | 7b |
| Elwha Ranger Station | Apr 9 | Nov 3 | 209 | 8b |
| Entiat Fish Hatchery | Apr 5 | Oct 24 | 200 | 7a |
| Ephrata Municipal Airport | Apr 22 | Oct 17 | 175 | 6b |
| Everett | Mar 24 | Nov 2 | 223 | 8b |
| Everett Snohomish Airport | Mar 9 | Nov 17 | 250 | 9a |
| Forks | Apr 26 | Oct 25 | 182 | 8b |
| Friday Harbor Airport | Mar 26 | Nov 10 | 230 | 9a |
| Glenoma | Apr 24 | Oct 15 | 176 | 8a |
| Goldendale | May 19 | Sep 25 | 126 | 7a |
| Grayland | Mar 29 | Nov 7 | 224 | 9a |
| Grays River Hatchery | Apr 27 | Oct 22 | 178 | 8b |
| Harrington | May 31 | Sep 12 | 101 | 6b |
| Hartline | May 2 | Oct 12 | 162 | 6b |
| Hatton | Apr 25 | Oct 15 | 173 | 7a |
| Holden Village | May 25 | Sep 19 | 114 | 6b |
| Hoquiam Bowerman Airport | Mar 30 | Nov 14 | 228 | 8b |
| Humptulips Salmon Hatchery | Apr 26 | Oct 22 | 180 | 9a |
| Ice Harbor Dam | Apr 7 | Oct 22 | 199 | 7a |
| Kennewick | Mar 28 | Oct 30 | 216 | 7b |
| Kent | Mar 20 | Nov 10 | 233 | 9a |
| Lacrosse | May 13 | Sep 26 | 133 | 7a |
| Landsburg | Apr 20 | Oct 25 | 187 | 8b |
| Leavenworth | May 10 | Sep 30 | 142 | 7a |
| Lind | May 7 | Oct 4 | 150 | 7a |
| Long Beach Experiment Station | Apr 6 | Oct 26 | 200 | 9a |
| Longmire Rainier Nps | May 22 | Oct 3 | 134 | 7a |
| Longview | Apr 8 | Nov 5 | 210 | 8b |
| Matlock | Apr 23 | Oct 20 | 183 | 8b |
| Mayfield Power Plant | Apr 7 | Nov 13 | 215 | 8b |
| Mazama | May 9 | Sep 29 | 142 | 6b |
| McMillin Reservoir | Apr 11 | Oct 30 | 202 | 8b |
| McNary Dam | Mar 27 | Nov 4 | 221 | 7b |
| Methow | Apr 21 | Oct 15 | 177 | 7a |
| Monroe | Apr 17 | Oct 23 | 188 | 8b |
| Moses Lake Grant County Airport | Apr 27 | Oct 8 | 165 | 7a |
| Mount Adams Ranger Station | May 18 | Sep 25 | 125 | 7a |
| Mount Vernon | Mar 24 | Nov 3 | 224 | 8b |
| Moxee City | May 4 | Oct 10 | 155 | 7a |
| Mud Mountain Dam | Apr 18 | Oct 31 | 196 | 8b |
| Naselle | Apr 24 | Oct 20 | 179 | 8b |
| Newhalem | Apr 2 | Nov 14 | 224 | 7a |
| Newport | May 12 | Sep 21 | 130 | 6a |
| Northport | May 8 | Oct 1 | 143 | 6b |
| Odessa | May 14 | Sep 26 | 135 | 6b |
| Olga | Feb 26 | Nov 29 | 276 | 8b |
| Olympia Airport | Apr 29 | Oct 14 | 169 | 8a |
| Omak Airport | Apr 30 | Oct 7 | 160 | 6b |
| Packwood | Apr 30 | Oct 8 | 162 | 7a |
| Palmer | Apr 3 | Nov 11 | 219 | 8b |
| Pasco Tri Cities Airport | Apr 27 | Oct 11 | 168 | 7b |
| Plain | May 22 | Sep 22 | 121 | 7a |
| Pomeroy | May 2 | Oct 4 | 155 | 7a |
| Port Angeles | Mar 12 | Nov 19 | 252 | 8b |
| Port Angeles International Airport | Apr 8 | Oct 31 | 204 | 8b |
| Port Townsend | Mar 1 | Nov 28 | 274 | 9a |
| Priest Rapids Dam | Mar 24 | Nov 4 | 222 | 7a |
| Prosser | Apr 14 | Oct 22 | 189 | 7b |
| Pullman | May 6 | Sep 29 | 143 | 6b |
| Pullman Moscow Regional Airport | Apr 29 | Oct 2 | 159 | 6b |
| Quilcene | Apr 11 | Oct 28 | 199 | 8b |
| Quillayute State Airport | Apr 20 | Oct 26 | 190 | 9a |
| Quinault | Apr 7 | Nov 10 | 214 | 8b |
| Quincy | Apr 21 | Oct 16 | 178 | 7a |
| Raymond | Apr 26 | Oct 17 | 177 | 8a |
| Renton Municipal Airport | Mar 13 | Nov 16 | 248 | 9a |
| Republic | May 30 | Sep 10 | 102 | 6a |
| Richland | Apr 6 | Oct 24 | 200 | 7b |
| Ritzville | May 7 | Oct 10 | 153 | 6b |
| Rosalia | May 7 | Sep 28 | 144 | 6b |
| Ross Dam | Apr 8 | Nov 10 | 214 | 7a |
| Sagemoor | Apr 30 | Oct 13 | 166 | 7a |
| Satus Pass | Jun 2 | Oct 1 | 119 | 7a |
| Seattle Boeing Field | Mar 13 | Nov 17 | 247 | 9a |
| Seattle Sand Point | Mar 8 | Nov 23 | 259 | 9a |
| Seattle Tacoma International Airport | Mar 2 | Nov 23 | 266 | 9a |
| Sedro-Woolley | Mar 27 | Nov 6 | 224 | 8b |
| Selah | May 5 | Oct 4 | 149 | 7a |
| Sequim | Apr 21 | Oct 20 | 181 | 8b |
| Shelton Sanderson Field | Apr 27 | Oct 16 | 175 | 8b |
| Skamania Fish Hatchery | Apr 29 | Oct 22 | 177 | 8b |
| Smyrna | Apr 23 | Oct 12 | 172 | 7a |
| Snoqualmie Falls | Mar 30 | Nov 7 | 223 | 8b |
| Snowden | May 12 | Oct 11 | 149 | 7a |
| Spokane | May 10 | Sep 26 | 137 | 6b |
| Spokane 17 mi SSW | May 30 | Sep 4 | 94 | 6b |
| Spokane Felts Field | Apr 26 | Oct 15 | 170 | 7a |
| Spokane International Airport | Apr 26 | Oct 12 | 168 | 6b |
| St. John | Apr 29 | Oct 4 | 161 | 6b |
| Stampede Pass | May 14 | Oct 17 | 154 | 7a |
| Startup | Apr 15 | Oct 25 | 192 | 8b |
| Stehekin | Apr 27 | Oct 17 | 173 | 6b |
| Sunnyside | May 1 | Oct 6 | 157 | 7b |
| Sunnyside No. 2 | Apr 30 | Oct 8 | 160 | 7b |
| Tacoma | Mar 8 | Nov 14 | 250 | 9a |
| Tacoma Narrows Airport | Mar 11 | Nov 21 | 254 | 9a |
| The Dalles Municipal Airport | Apr 11 | Oct 26 | 197 | 8a |
| Toledo Faa Airport | Apr 5 | Oct 25 | 196 | 8a |
| Tolt S Fork Reservoir | Apr 13 | Nov 10 | 210 | 8a |
| Tonasket 11 mi NE | May 6 | Oct 6 | 151 | 6b |
| Tonasket 4 mi NNE | Apr 26 | Oct 10 | 168 | 6b |
| Upper Baker Dam | Apr 24 | Oct 29 | 190 | 8a |
| Vancouver | Apr 26 | Oct 18 | 177 | 8b |
| Vancouver Pearson Airport | Mar 29 | Nov 9 | 223 | 8b |
| Walla Walla Regional Airport | Mar 27 | Oct 31 | 219 | 7a |
| Wapato | Apr 21 | Oct 15 | 176 | 7a |
| Waterville | May 14 | Oct 1 | 140 | 7a |
| Wenatchee | Apr 4 | Oct 28 | 208 | 7a |
| Wenatchee Pangborn Airport | Apr 8 | Oct 24 | 200 | 7a |
| Whidbey Island Naval Air Station | Mar 13 | Nov 14 | 244 | 8b |
| Whitman Mission | May 2 | Oct 1 | 151 | 7a |
| Wilbur | Jun 1 | Sep 22 | 112 | 6b |
| Winthrop | May 15 | Sep 22 | 127 | 6b |
| Yakima | Apr 8 | Oct 23 | 196 | 7a |
| Yakima Air Terminal | May 8 | Oct 4 | 149 | 7a |
Median dates from NOAA 1991–2020 climate normals. How to read them.