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Planting calendar for ZIP 82604 (Casper, WY)

When to plant vegetables in Casper, WY (USDA hardiness zone 5a). Typical last spring frost around May 26, 2026 11 days year to year), first fall frost around Sep 22, 202611 days).

Playing it safe? Spring frost holds off until about Jun 9, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

See the full Casper, WY planting calendar for dates typical of the whole city.

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Month by month in Casper, WY

February

March

April

May

June

July

Understand your frost dates

Frost dates for ZIP 82604: NOAA 1991-2020 normals (USW00024089 CASPER NATRONA CO AP, WY US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.