Washington Frost Dates
Washington gives gardeners a split personality climate, with mild marine conditions west of the Cascades and drier, colder patterns inland. Coastal and Puget Sound areas often enjoy gentler frost timing, while interior valleys and higher country can swing colder and hold frost later.
Look up your exact frost dates
Frost timing shifts across Washington with elevation and distance from water. Enter your ZIP code for dates from your nearest weather station.
Washington locations
| ZIP | Area | Hardiness zone |
|---|---|---|
| 98057 | Renton | 9a |
| 98108 | Seattle | 9a |
| 98115 | Seattle | 9a |
| 98148 | Burien | 9a |
| 98158 | SeaTac | 9a |
| 98178 | Bryn Mawr-Skyway | 9a |
| 98201 | Everett | 8b |
| 98204 | Everett | 9a |
| 98275 | Mukilteo | 8b |
| 98278 | Whidbey Island Station | 8b |
| 98374 | South Hill | 8b |
| 98421 | Tacoma | 9a |
| 98501 | Tumwater | 8a |
| 98584 | Shelton | 8b |
| 98616 | Cougar | 8a |
| 98621 | Grays River | 8b |
| 98639 | North Bonneville | 9a |
| 98665 | Hazel Dell | 8b |
| 99169 | Ritzville | 6b |
| 99212 | Spokane Valley | 7a |
| 98001 | Auburn | 8b |
| 98002 | Auburn | 8b |
| 98003 | Federal Way | 8b |
| 98004 | Bellevue | 9a |
| 98005 | Bellevue | 9a |
| 98006 | Bellevue | 8b |
| 98007 | Bellevue | 8b |
| 98008 | Bellevue | 8b |
| 98010 | Black Diamond | 8b |
| 98011 | Bothell | 8b |
| 98012 | Mill Creek East | 8b |
| 98014 | Lake Marcel-Stillwater | 8b |
| 98019 | Duvall | 8b |
| 98020 | Edmonds | 9a |
| 98021 | Bothell | 8b |
| 98022 | Greenwater | 8a |
| 98023 | Federal Way | 8b |
| 98024 | Fall City | 8b |
| 98025 | Hobart | 8b |
| 98026 | Edmonds | 9a |
| 98027 | Issaquah | 8b |
| 98028 | Kenmore | 9a |
| 98029 | Sammamish | 8b |
| 98030 | Kent | 8b |
| 98031 | Kent | 8b |
| 98032 | Kent | 9a |
| 98033 | Kirkland | 9a |
| 98034 | Kirkland | 9a |
| 98036 | Alderwood Manor | 9a |
| 98037 | Lynnwood | 9a |
| 98038 | Hobart | 8b |
| 98039 | Medina | 9a |
| 98040 | Mercer Island | 9a |
| 98042 | Covington | 8b |
| 98043 | Mountlake Terrace | 9a |
| 98045 | Riverpoint | 8a |
| 98047 | Pacific | 8b |
| 98050 | Fall City | 8b |
| 98051 | Ravensdale | 8b |
| 98052 | Redmond | 8b |
Source: NOAA 1991–2020 U.S. Climate Normals (public domain) and USDA 2023 Plant Hardiness Zone Map. Page updated Aug 4, 2026.