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Planting calendar for ZIP 82426 (Greybull, WY)

When to plant vegetables in Greybull, WY (USDA hardiness zone 4b). Typical last spring frost around May 11, 2026 9 days year to year), first fall frost around Sep 23, 202610 days).

Playing it safe? Spring frost holds off until about May 22, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Greybull, WY

January

February

March

April

May

June

July

Understand your frost dates

Frost dates for ZIP 82426: NOAA 1991-2020 normals (USC00484080 GREYBULL, WY US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.