USDA hardiness zones in Washington
| Zone | Avg. extreme minimum | ZIP codes | Example cities |
|---|---|---|---|
| Zone 6a | −10 to −5°F | 17 | Colville |
| Zone 6b | −5 to 0°F | 86 | Pullman, Ellensburg, Liberty Lake, Cheney |
| Zone 7a | 0 to 5°F | 110 | Spokane, Spokane Valley, Yakima, Wenatchee |
| Zone 7b | 5 to 10°F | 25 | Kennewick, Pasco, Richland, West Richland |
| Zone 8a | 10 to 15°F | 43 | Tumwater, Lynden, North Bend, Chehalis |
| Zone 8b | 15 to 20°F | 212 | Tacoma, Vancouver, Kent, Everett |
| Zone 9a | 20 to 25°F | 100 | Seattle, Bellevue, Renton, Kirkland |
| Zone 9b | 25 to 30°F | 1 | — |
Growing zone and frost dates by city
| City | Zone | Frost dates |
|---|---|---|
| Seattle | 9a (20 to 25°F) | Seattle frost dates |
| Spokane | 7a (0 to 5°F) | Spokane frost dates |
| Tacoma | 8b (15 to 20°F) | Tacoma frost dates |
| Vancouver | 8b (15 to 20°F) | Vancouver frost dates |
| Bellevue | 9a (20 to 25°F) | Bellevue frost dates |
| Kent | 8b (15 to 20°F) | Kent frost dates |
| Everett | 8b (15 to 20°F) | Everett frost dates |
| Spokane Valley | 7a (0 to 5°F) | Spokane Valley frost dates |
| Renton | 9a (20 to 25°F) | Renton frost dates |
| Federal Way | 8b (15 to 20°F) | Federal Way frost dates |
| Yakima | 7a (0 to 5°F) | Yakima frost dates |
| Kirkland | 9a (20 to 25°F) | Kirkland frost dates |
| Bellingham | 8b (15 to 20°F) | Bellingham frost dates |
| Kennewick | 7b (5 to 10°F) | Kennewick frost dates |
| Auburn | 8b (15 to 20°F) | Auburn frost dates |
| Pasco | 7b (5 to 10°F) | Pasco frost dates |
| Redmond | 8b (15 to 20°F) | Redmond frost dates |
| Marysville | 8b (15 to 20°F) | Marysville frost dates |
| Shoreline | 9a (20 to 25°F) | Shoreline frost dates |
| Sammamish | 8b (15 to 20°F) | Sammamish frost dates |
| Richland | 7b (5 to 10°F) | Richland frost dates |
| Lakewood | 8b (15 to 20°F) | Lakewood frost dates |
| Lacey | 8b (15 to 20°F) | Lacey frost dates |
| Olympia | 8b (15 to 20°F) | Olympia frost dates |
| Bothell | 8b (15 to 20°F) | Bothell frost dates |
| Burien | 9a (20 to 25°F) | Burien frost dates |
| Bremerton | 8b (15 to 20°F) | Bremerton frost dates |
| Edmonds | 9a (20 to 25°F) | Edmonds frost dates |
| Puyallup | 8b (15 to 20°F) | Puyallup frost dates |
| Lynnwood | 9a (20 to 25°F) | Lynnwood frost dates |
| Lake Stevens | 8b (15 to 20°F) | Lake Stevens frost dates |
| Issaquah | 8b (15 to 20°F) | Issaquah frost dates |
| Longview | 8b (15 to 20°F) | Longview frost dates |
| Wenatchee | 7a (0 to 5°F) | Wenatchee frost dates |
| University Place | 8b (15 to 20°F) | University Place frost dates |
| Mount Vernon | 8b (15 to 20°F) | Mount Vernon frost dates |
| SeaTac | 9a (20 to 25°F) | SeaTac frost dates |
| Walla Walla | 7a (0 to 5°F) | Walla Walla frost dates |
| Pullman | 6b (−5 to 0°F) | Pullman frost dates |
| Des Moines | 9a (20 to 25°F) | Des Moines frost dates |
| Maple Valley | 8b (15 to 20°F) | Maple Valley frost dates |
| Tumwater | 8a (10 to 15°F) | Tumwater frost dates |
| Camas | 8b (15 to 20°F) | Camas frost dates |
| Moses Lake | 7a (0 to 5°F) | Moses Lake frost dates |
| Mountlake Terrace | 9a (20 to 25°F) | Mountlake Terrace frost dates |
| Mercer Island | 9a (20 to 25°F) | Mercer Island frost dates |
| Bainbridge Island | 9a (20 to 25°F) | Bainbridge Island frost dates |
| Kenmore | 9a (20 to 25°F) | Kenmore frost dates |
| Oak Harbor | 8b (15 to 20°F) | Oak Harbor frost dates |
| Battle Ground | 8b (15 to 20°F) | Battle Ground frost dates |
| Bonney Lake | 8b (15 to 20°F) | Bonney Lake frost dates |
| Arlington | 8b (15 to 20°F) | Arlington frost dates |
| Tukwila | 9a (20 to 25°F) | Tukwila frost dates |
| Covington | 8b (15 to 20°F) | Covington frost dates |
| Ellensburg | 6b (−5 to 0°F) | Ellensburg frost dates |
| Mukilteo | 8b (15 to 20°F) | Mukilteo frost dates |
| Mill Creek | 8b (15 to 20°F) | Mill Creek frost dates |
| Port Angeles | 8b (15 to 20°F) | Port Angeles frost dates |
| Monroe | 8b (15 to 20°F) | Monroe frost dates |
| Port Orchard | 9a (20 to 25°F) | Port Orchard frost dates |
| Centralia | 8b (15 to 20°F) | Centralia frost dates |
| West Richland | 7b (5 to 10°F) | West Richland frost dates |
| Anacortes | 8b (15 to 20°F) | Anacortes frost dates |
| Washougal | 9a (20 to 25°F) | Washougal frost dates |
| Ferndale | 8b (15 to 20°F) | Ferndale frost dates |
| Aberdeen | 8b (15 to 20°F) | Aberdeen frost dates |
| Lynden | 8a (10 to 15°F) | Lynden frost dates |
| Sunnyside | 7b (5 to 10°F) | Sunnyside frost dates |
| Ridgefield | 8b (15 to 20°F) | Ridgefield frost dates |
| Woodinville | 8b (15 to 20°F) | Woodinville frost dates |
| East Wenatchee | 7a (0 to 5°F) | East Wenatchee frost dates |
| Liberty Lake | 6b (−5 to 0°F) | Liberty Lake frost dates |
| Snoqualmie | 8b (15 to 20°F) | Snoqualmie frost dates |
| Edgewood | 8b (15 to 20°F) | Edgewood frost dates |
| Sedro-Woolley | 8b (15 to 20°F) | Sedro-Woolley frost dates |
| Lake Forest Park | 9a (20 to 25°F) | Lake Forest Park frost dates |
| Enumclaw | 8b (15 to 20°F) | Enumclaw frost dates |
| Newcastle | 8b (15 to 20°F) | Newcastle frost dates |
| Kelso | 8b (15 to 20°F) | Kelso frost dates |
| Poulsbo | 8b (15 to 20°F) | Poulsbo frost dates |
| Cheney | 6b (−5 to 0°F) | Cheney frost dates |
| Gig Harbor | 8b (15 to 20°F) | Gig Harbor frost dates |
| Grandview | 7b (5 to 10°F) | Grandview frost dates |
| Yelm | 8b (15 to 20°F) | Yelm frost dates |
| Airway Heights | 6b (−5 to 0°F) | Airway Heights frost dates |
| Burlington | 8b (15 to 20°F) | Burlington frost dates |
| Fife | 8b (15 to 20°F) | Fife frost dates |
| Shelton | 8b (15 to 20°F) | Shelton frost dates |
| Sumner | 8b (15 to 20°F) | Sumner frost dates |
| Snohomish | 8b (15 to 20°F) | Snohomish frost dates |
| Port Townsend | 8b (15 to 20°F) | Port Townsend frost dates |
| College Place | 7a (0 to 5°F) | College Place frost dates |
| DuPont | 8b (15 to 20°F) | DuPont frost dates |
| Duvall | 8b (15 to 20°F) | Duvall frost dates |
| Stanwood | 8b (15 to 20°F) | Stanwood frost dates |
| Othello | 7a (0 to 5°F) | Othello frost dates |
| Milton | 8b (15 to 20°F) | Milton frost dates |
| Orting | 8b (15 to 20°F) | Orting frost dates |
| Ephrata | 6b (−5 to 0°F) | Ephrata frost dates |
| North Bend | 8a (10 to 15°F) | North Bend frost dates |
| Hoquiam | 8b (15 to 20°F) | Hoquiam frost dates |
| Selah | 7a (0 to 5°F) | Selah frost dates |
| Toppenish | 7a (0 to 5°F) | Toppenish frost dates |
| Quincy | 7a (0 to 5°F) | Quincy frost dates |
| Sequim | 8b (15 to 20°F) | Sequim frost dates |
| Ocean Shores | 9a (20 to 25°F) | Ocean Shores frost dates |
| Chehalis | 8a (10 to 15°F) | Chehalis frost dates |
| Sultan | 8b (15 to 20°F) | Sultan frost dates |
| Clarkston | 7a (0 to 5°F) | Clarkston frost dates |
| Pacific | 8b (15 to 20°F) | Pacific frost dates |
| Black Diamond | 8b (15 to 20°F) | Black Diamond frost dates |
| Fircrest | 8b (15 to 20°F) | Fircrest frost dates |
| Prosser | 7b (5 to 10°F) | Prosser frost dates |
| Steilacoom | 8b (15 to 20°F) | Steilacoom frost dates |
| Union Gap | 7a (0 to 5°F) | Union Gap frost dates |
| Woodland | 8b (15 to 20°F) | Woodland frost dates |
| Normandy Park | 9a (20 to 25°F) | Normandy Park frost dates |
| Brier | 9a (20 to 25°F) | Brier frost dates |
| Blaine | 8b (15 to 20°F) | Blaine frost dates |
| Buckley | 8b (15 to 20°F) | Buckley frost dates |
| Deer Park | 6b (−5 to 0°F) | Deer Park frost dates |
| Omak | 7a (0 to 5°F) | Omak frost dates |
| Colville | 6a (−10 to −5°F) | Colville frost dates |
| Connell | 7a (0 to 5°F) | Connell frost dates |
Frequently asked questions
What growing zone is Washington in?
Washington’s ZIP codes span USDA zones 6a to 9b, and 8b is the most common. Zones vary with elevation and distance from water, so check your own ZIP code.
When should I plant?
Hardiness zones are about winter cold, not planting dates. For timing, use the last spring frost date for your city on our Washington frost dates page.