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Crop dates by placeOnions Planting Dates by State and Region
Published onions planting windows for 4 places, with the source and the caveats you need before you use them.
Across the 4 places in this data set, the planting window begins as early as Feb 1 (Arkansas) and as late as Aug 1 (Utah). The middle of the range starts around Mar 31.
| Place | Planting | Harvest |
|---|---|---|
| Arkansas | Planting: February - April (spring/summer crop) | |
| Utah | Planting: fall harvest planting August 1 to August 10 | |
| Western Oregon | Planting: March (if soil is dry enough) | |
| Western valleys (Portland, Roseburg, Medford), Oregon | Planting: May |
Calendar view
| Item | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Arkansas planting | Planting window in February | Planting window in March | Planting window in April | |||||||||
| Utah planting | Planting window in August | |||||||||||
| Western Oregon planting | Planting window in March | |||||||||||
| Western valleys (Portland, Roseburg, Medford), Oregon planting | 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: Arkansas Extension - Spring and Summer Vegetable Planting Dates.