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Planting calendar for ZIP 61411 (Adair, IL)

When to plant vegetables in Adair, IL (USDA hardiness zone 6a). Typical last spring frost around Apr 17, 2026 11 days year to year), first fall frost around Oct 22, 202610 days).

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

See the full Adair, IL planting calendar for dates typical of the whole city.

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Month by month in Adair, IL

January

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March

April

May

August

Understand your frost dates

Frost dates for ZIP 61411: NOAA 1991-2020 normals (USC00116970 PRAIRIE CITY 2S, IL US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.