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What can I grow here, and when?
Frost dates, planting zones, soil types, and what actually thrives in Washington — from mountains to coast.
Frost dates & zones
Washington spans USDA zones 4b (northeastern WA / Okanogan Highlands) to 9b (Seattle / Puget Sound lowlands). Verify your exact zone and frost dates with your county Extension office — elevation and microclimates create real variation.
Hardiness Zones
4b (northeastern WA / Okanogan Highlands) to 9b (Seattle / Puget Sound lowlands)
Last frost: varies by region. First frost: varies by region.
Look up your exact zone by ZIP at USDA →What grows well here
Western WA clay soils need gypsum and compost — raised beds are the best solution for drainage. Eastern WA soils are productive under irrigation but may need organic matter. WSU Extension county offices are excellent for regional soil guidance.
Know your soil
Western Washington's Puget Sound lowlands have clay-heavy soils that drain poorly — raised beds dramatically improve gardening. The Skagit Valley has some of the best agricultural soils in the state — rich alluvial delta soils. Eastern Washington's Columbia Basin has productive loam soils under irrigation. Volcanic soils near the Cascades are acidic and sandy.
Map your soil type with USDA Web Soil Survey →Free soil testing
Free or low-cost soil testing available through your county Extension office
Results include specific lime and fertilizer recommendations
Most states offer testing April through fall — fees apply in winter
Results typically returned within 10 business days
Next steps
Preserve what you grow
Washington Extension offers food preservation workshops — and NWS has the full canning guides.
Food IndependenceGet the checklist
Spring prep, frost protection, soil test timing, and compost setup — timed to regional frost dates.
WA Checklists