Deconstruct SunWashington Hardiness Zones
Washington covers USDA plant hardiness zones 5b to 9b on the 2023 map, so its coldest areas average −15 to −10 °F on the coldest winter night. Find your zone by ZIP code, or pick a city below for its zone, sunrise and daylight by month.
Washington hardiness zone map
This is not the official USDA Plant Hardiness Zone Map. Zones are derived from the official 2023 dataset, resampled to about 2 km. Dots mark cities with their own page.
Source: USDA Plant Hardiness Zone Map, 2023. Agricultural Research Service, U.S. Department of Agriculture, planthardiness.ars.usda.gov. Underlying data © PRISM Group, Oregon State University, prism.oregonstate.edu, accessed 2026-08-30.
Zones and daylight by city
| City | Zone | Coldest night | Longest day | Shortest day |
|---|---|---|---|---|
| Seattle | 9a | 20 to 25 °F | 15h 59m | 8h 25m |
| Spokane | 7a | 0 to 5 °F | 16h 00m | 8h 25m |
| Tacoma | 8b | 15 to 20 °F | 15h 56m | 8h 28m |
| Vancouver | 8b | 15 to 20 °F | 15h 42m | 8h 41m |
| Bellevue | 9a | 20 to 25 °F | 15h 59m | 8h 26m |
| Kent | 8b | 15 to 20 °F | 15h 57m | 8h 27m |
| Everett | 8b | 15 to 20 °F | 16h 03m | 8h 23m |
| Olympia | 8b | 15 to 20 °F | 15h 54m | 8h 30m |
| Bellingham | 8b | 15 to 20 °F | 16h 10m | 8h 16m |
| Yakima | 7a | 0 to 5 °F | 15h 50m | 8h 34m |
| Kennewick | 7b | 5 to 10 °F | 15h 47m | 8h 37m |
| Walla Walla | 7b | 5 to 10 °F | 15h 46m | 8h 38m |
| Wenatchee | 7b | 5 to 10 °F | 15h 58m | 8h 27m |
Gardening in Washington?
Your zone says what survives winter. Deconstruct Sun measures how many hours of direct sun your exact spot gets, so you can pick plants that thrive. Free on iPhone.
Questions
What hardiness zones are in Washington?
Washington spans USDA zones 5b to 9b on the 2023 map. Among its larger cities, Spokane is coldest (zone 7a) and Seattle is warmest (zone 9a).
How do I find my exact zone in Washington?
Enter your ZIP code in the hardiness zone lookup on this site. It reads the 2023 USDA data for that ZIP and warns you if you are near a zone boundary.
How much sun do gardens in Washington get?
In Seattle, an open spot gets up to 16.0 hours of daylight in June but only 8.4 in December. Trees and buildings cut that down, especially in winter. The Deconstruct Sun app measures the real direct-sun hours for one exact spot.