Soybeans planting in Illinois.
Soybeans planting in Illinois is shaped by the state's 6a dominant hardiness zone, last frost date around April 25, and a 175-day growing season. Soybeans is widely grown in Illinois — commercially significant or common in home gardens and food plots.
Planting dates on this page are climatological estimates from USDA frost-date norms and zone-typical planting offsets. Verify against University of Illinois Extension for variety- and county-specific guidance.
Planting calendar — 2026
Planting windows shift earlier in southern parts of the state and later in northern parts. Use last frost date in your specific county as the reference.
Planting windows
Spring planting
SoybeansHarvest window
Harvest timing varies with planting date and seasonal weather — these dates are typical for the ideal planting window.
Growing notes
Soybeans grows well in Illinois's typical climate. Illinois's 175-day growing season and 6a hardiness zone support reliable production with appropriate variety selection.
Soybeans is widely grown in Illinois — commercially significant or common in home gardens and food plots.
Agronomy reference
Growing-degree-day requirement: 2400 GDD (base 50°F) from planting to maturity.
Maturity group system (MG 0 northern through MG 8 southern) is the primary variety selection input — select MG for your latitude.
Common pests to watch
- Soybean aphid
- Bean leaf beetle
- Stink bugs
Pest pressure varies by region and year. Confirm current outbreaks with University of Illinois Extension.
Common diseases
- Sudden death syndrome
- White mold
- Soybean cyst nematode
Resistance varieties shift each year. Check the current variety trial report for your state.
Variety selection
Soybeans varieties for Illinois live with your extension service.
Variety performance is micro-regional and changes with each year’s trial cycle. We don’t republish variety lists — instead, we point directly at the source.
Search the extension site for “soybeansvariety trial” or “recommended soybeans varieties” to find the current report.
Yield varies significantly by variety, soil, fertility, and management. Consult your state extension service for variety performance trials in your region.
Beyond the harvest
Soybeans as a hunting food plot.
Soybeans are a primary deer food during summer growth and through pod fill. Standing soybeans through winter provide late-season hunting attraction.
Soybeans timing. Live alerts.
Bield: Farm ties weather and soil-temperature stations in your county to crop planting thresholds — get notified the day soil temp clears your target window.