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Planting calendar for ZIP 82510 (Arapahoe, WY)

When to plant vegetables in Arapahoe, WY (USDA hardiness zone 5a). Typical last spring frost around May 16, 2026 12 days year to year), first fall frost around Sep 28, 202611 days).

Playing it safe? Spring frost holds off until about May 31, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Arapahoe, WY

February

March

April

May

June

July

August

Understand your frost dates

Frost dates for ZIP 82510: NOAA 1991-2020 normals (USW00024061 RIVERTON, WY US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.