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Planting Guide
December
Illinois

What to Plant in December in Illinois

Here's what you can plant in Illinois during December. Since Illinois spans multiple USDA zones, planting dates vary by location. Find your zone below.

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Data sources: USDA Plant Hardiness Zone Map (2023), NOAA 30-Year Climate Normals. Last updated: May 2026.

Sources & credits

Every number on this page traces back to a primary horticulture or government data source. Click through to verify.

Plant varieties + growing data

USDA PLANTS Database government
UMass Extension Vegetable Program extension
Cornell Cooperative Extension extension
UC Agriculture & Natural Resources — Vegetable Research & Information Center extension
Clemson Cooperative Extension Home & Garden Information Center extension
Rodale Institute research nonprofit
KidsGardening.org research nonprofit
National 4-H Council — School & Youth Gardens research nonprofit

Household-consumption benchmarks

USDA Food Consumption Surveys (WWEIA / NHANES) government

Frost dates

NOAA Global Historical Climatology Network (daily) government

Precipitation + climate normals

NOAA U.S. Climate Normals (1991–2020) government

Soil survey + temperature data

USDA Soil Survey Geographic Database (SSURGO) government
NOAA NWS NOWData government

Drought monitoring

U.S. Drought Monitor academic

Pest + disease pressure

USDA Regional IPM Centers government

Local extension offices

USDA Land-Grant University Directory government

Daylight hours + sun data

U.S. Naval Observatory / Astronomical Almanac government

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