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Planting calendar for ZIP 52301 (Marengo, IA)

When to plant vegetables in Marengo, IA (USDA hardiness zone 5a). Typical last spring frost around Apr 28, 2026 11 days year to year), first fall frost around Oct 9, 202611 days).

Playing it safe? Spring frost holds off until about May 12, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Marengo, IA

January

February

March

April

May

July

August

Understand your frost dates

Frost dates for ZIP 52301: NOAA 1991-2020 normals (USC00139067 WILLIAMSBURG 1E, IA US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.