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Planting calendar for ZIP 66955 (Mahaska, KS)

When to plant vegetables in Mahaska, KS (USDA hardiness zone 6a). Typical last spring frost around Apr 25, 2026 11 days year to year), first fall frost around Oct 15, 202610 days).

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

See the full Mahaska, KS planting calendar for dates typical of the whole city.

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Month by month in Mahaska, KS

January

February

March

April

May

August

Understand your frost dates

Frost dates for ZIP 66955: NOAA 1991-2020 normals (USC00252820 FAIRBURY 5S, NE US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.