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Planting calendar for ZIP 61259 (Illinois City, IL)

When to plant vegetables in Illinois City, IL (USDA hardiness zone 5b). Typical last spring frost around Apr 18, 2026 11 days year to year), first fall frost around Oct 24, 202610 days).

Playing it safe? Spring frost holds off until about May 2, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Illinois City, IL

January

February

March

April

May

August

Understand your frost dates

Frost dates for ZIP 61259: NOAA 1991-2020 normals (USC00114355 ILLINOIS CITY DAM 16, IL US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.