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Planting calendar for ZIP 52146 (Harpers Ferry, IA)

When to plant vegetables in Harpers Ferry, IA (USDA hardiness zone 5a). Typical last spring frost around Apr 24, 2026 11 days year to year), first fall frost around Oct 17, 20269 days).

Playing it safe? Spring frost holds off until about May 8, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Harpers Ferry, IA

January

February

March

April

May

August

Understand your frost dates

Frost dates for ZIP 52146: NOAA 1991-2020 normals (USC00474937 LYNXVILLE DAM 9, WI US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.