Home / Planting dates / Onions / Western valleys (Portland, Roseburg, Medford), Oregon
Onions planting and harvest datesOnions Planting Dates in Western valleys (Portland, Roseburg, Medford), Oregon
Usual onions planting periods in Western valleys (Portland, Roseburg, Medford), 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 | May | source | 2026-11-11 |
| Item | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Planting | Planting window in May |
What these dates mean in Western valleys (Portland, Roseburg, Medford), Oregon
Planting usually runs about 31 days, from May 1 to May 31.
That start date is about 31 days later 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 valleys (Portland, Roseburg, Medford), 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 valleys (Portland, Roseburg, Medford), Oregon
- Broccoli
- Brussels sprouts
- Cabbage
- Cantaloupes
- Carrots
- Cauliflower
- Chard
- Chives
- Eggplant
- Endive
- Kale
- Leeks
- Lettuce
- Lima beans
- Parsnips
- Peas
- Peppers
- Pickling cucumbers
- Potatoes
- Pumpkins
- Radishes
- Rhubarb
- Rutabagas
- Slicing cucumbers
- Snap beans
- Spinach
- Summer squash
- Tomatoes
- Turnips
- Watermelon
- Winter squash
Last reviewed: November 2026. Source: OSU Extension may garden calendar.