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Wyoming · Local Gardening
Frost dates, planting zones, soil types, and what actually thrives in Wyoming — from mountains to coast.
Frost dates & zones
Wyoming spans USDA zones 3a (Yellowstone / high mountain valleys) to 5b (Cheyenne / eastern WY plains). Verify your exact zone and frost dates with your county Extension office — elevation and microclimates create real variation.
Hardiness Zones
3a (Yellowstone / high mountain valleys) to 5b (Cheyenne / eastern WY plains)
Last frost: varies by region. First frost: varies by region.
Look up your exact zone by ZIP at USDA →What grows well here
Wyoming soils need organic matter and often sulfur to lower alkaline pH. Short growing seasons — often 90-120 days — require short-season varieties. Irrigation is essential across most of the state. UW Extension county offices provide Wyoming-specific guidance.
Know your soil
Wyoming soils are predominantly alkaline, thin, and dry. The eastern plains have fertile but dry soils that need irrigation. High mountain valley soils are thin and rocky with extremely short growing seasons. The Bighorn Basin has productive soils under irrigation. Wind erosion is severe across exposed areas.
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
Wyoming 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.
WY Checklists