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Planting calendar for ZIP 52101 (Decorah, IA)

When to plant vegetables in Decorah, IA (USDA hardiness zone 5a). Typical last spring frost around May 3, 2026 11 days year to year), first fall frost around Oct 7, 202610 days).

Playing it safe? Spring frost holds off until about May 17, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

See the full Decorah, IA planting calendar for dates typical of the whole city.

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Month by month in Decorah, IA

January

February

March

April

May

July

August

Understand your frost dates

Frost dates for ZIP 52101: NOAA 1991-2020 normals (USC00132110 DECORAH, IA US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.