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Crop dates by placeSweet Potato Planting Dates by State and Region
Published sweet potato 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 Apr 28 (Southern Illinois) and as late as May 24 (Northern Illinois). The middle of the range starts around May 10.
| Place | Planting | Harvest |
|---|---|---|
| Central Illinois | Planting: May 10 to June 1 | |
| Northern Illinois | Planting: May 24 to June 15 | |
| Southern Illinois | Planting: April 28 to May 15 |
Calendar view
| Item | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Central Illinois planting | Planting window in May | Planting window in June | ||||||||||
| Northern Illinois planting | Planting window in May | Planting window in June | ||||||||||
| Southern Illinois planting | Planting window in April | Planting window in May |
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.
Related guides
Last reviewed: November 2026. Source: Illinois Extension - When to Plant (Home Vegetable Gardening).