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Planting calendar for ZIP 83215 (Atomic City, ID)

When to plant vegetables in Atomic City, ID (USDA hardiness zone 4b). Typical last spring frost around Jun 11, 2026 16 days year to year), first fall frost around Sep 6, 202611 days).

Playing it safe? Spring frost holds off until about Jul 1, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

See the full Atomic City, ID planting calendar for dates typical of the whole city.

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Month by month in Atomic City, ID

March

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May

June

July

Understand your frost dates

Frost dates for ZIP 83215: NOAA 1991-2020 normals (USW00094143 IDAHO FALLS 46 W, ID US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.