What to Plant in September in Illinois
Here's what you can plant in Illinois during September. Since Illinois spans multiple USDA zones, planting dates vary by location. Find your zone below.
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
- PRISM/Oregon State per-ZIP USDA 2023 Zones academic
Soil survey + temperature data
- USDA Soil Data Access REST API government
- USDA Soil Survey Geographic Database (SSURGO) government
- NOAA NWS NOWData government
Drought monitoring
- US Drought Monitor academic
Household-consumption benchmarks
Derived
- USDA Hardiness Zone Template derived
Other
Frost dates
Modeling
- Regional Template (Modeled) internal
Precipitation + climate normals
- NOAA U.S. Climate Normals (1991–2020) government
Curated
- SouthTech Creations Curated internal
Pest + disease pressure
- USDA Regional IPM Centers government
Local extension offices
- USDA Land-Grant University Directory government