Last frost date in Wilsonville, Oregon
March 18
Average last frost in spring. In an early year (1 in 10) it's over by February 22; in a late year (1 in 10) it comes after April 10.
November 13
Average first frost in fall. 1 year in 10 it comes by October 27.
Source: NOAA U.S. Climate Normals 1991–2020, station N Willamette Exp Stn (USC00356151), 2.2 miles from Wilsonville, elevation 150 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Canby, so its frost dates are the same as Wilsonville's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Feb 22 | Mar 18 | Apr 10 |
| First frost in fall | Oct 27 | Nov 13 | Dec 6 |
Frost-free days in an average year: 243
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | Apr 17 | Oct 27 |
| Frost (32°F) | Every year | Mar 18 | Nov 13 |
| Hard freeze (28°F) | 10 years in 10 | Feb 13 | Dec 1 |
Nights at 32°F or colder in an average year: 45
What to plant now in Wilsonville
- Mustard greensAug 15 – Nov 1Now
- Garden peasSept 1 – Nov 1Now
- ParsleySept 1 – Nov 15Now
- RadishesSept 1 – Nov 15Now
- SpinachSept 15 – Nov 1Now
- Corn saladOct 1 – Dec 1Now
- Onion setsOct 1 – Dec 1Now
- Upland cressOct 1 – Dec 1Now
- Asparagus plantsDec 1 – Jan 1Soon
- Spring planting calendar for an average last frost around March 20 Wilsonville: March 18
- Fall planting calendar for an average first frost around November 10 Wilsonville: November 13
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5. How we match the table.
Nearby in Oregon
- Lake Oswego 8 mi · last frost Mar 18
- Newberg 9 mi · last frost Mar 21
- Beaverton 12 mi · last frost Apr 1
- Woodburn 12 mi · last frost Mar 16
- Molalla 14 mi · last frost Mar 16
Updated