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Crop dates by place

Green onions (sets) Planting Dates by State and Region

Published green onions (sets) planting windows for 3 places, with the source and the caveats you need before you use them.

Across the 3 places in this data set, the planting window begins as early as Mar 11 (Southern Illinois) and as late as Apr 9 (Northern Illinois). The middle of the range starts around Mar 25.

Green onions (sets) windows by place
PlacePlantingHarvest
Central IllinoisPlanting: March 25 to May 1
Northern IllinoisPlanting: April 9 to May 15
Southern IllinoisPlanting: March 11 to April 15

Calendar view

Green onions (sets) calendar by place
ItemJanFebMarAprMayJunJulAugSepOctNovDec
Central Illinois plantingPlanting window in MarchPlanting window in AprilPlanting window in May
Northern Illinois plantingPlanting window in AprilPlanting window in May
Southern Illinois plantingPlanting window in MarchPlanting window in April
Frost-date caveat: ranges blur real differences inside a state or region. Use them to plan, then fit them to your last frost date, soil temperature and field conditions.

Last reviewed: November 2026. Source: Illinois Extension - When to Plant (Home Vegetable Gardening).