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Onions planting and harvest datesOnions Planting Dates in Western Oregon
Usual onions planting periods in Western Oregon, shown as ranges with their source. Use them to frame a plan, then adjust for your own frost dates and soil temperature.
| Activity | Window | Source | Last verified |
|---|---|---|---|
| Planting | March (if soil is dry enough) | source | 2026-11-11 |
| Item | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Planting | Planting window in March |
What these dates mean in Western Oregon
Planting usually runs about 31 days, from Mar 1 to Mar 31.
That start date is about 30 days earlier than the middle of the 4 places in this data set that report onions planting dates (Mar 31).
Frost-date caveat: these are published ranges for Western Oregon. A northern or high-elevation site will run later than a southern or low one, and a cold wet spring can push planting past the window. Monthly advice is not applicable to all areas of Oregon; frost dates and local conditions vary. Check your last spring frost and soil temperature, and confirm with your county extension office.
Related guides
Onions dates in other places
Other crops in Western Oregon
- Beets
- Broccoli
- Brussels sprouts
- Bush beans
- Cabbage
- Carrots
- Cauliflower
- Chinese cabbage
- Chives
- Kale
- Leeks
- Lettuce
- Parsley
- Parsnips
- Peas
- Radishes
- Rhubarb
- Strawberries
- Turnips
Last reviewed: November 2026. Source: OSU Extension march garden calendar.