Last frost date in Portland, Oregon
February 25
Average last frost in spring. In an early year (1 in 10) it's over by January 24; in a late year (1 in 10) it comes after March 21.
December 1
Average first frost in fall. 1 year in 10 it comes by November 10.
Source: NOAA U.S. Climate Normals 1991–2020, station Portland Kgw-tv (USC00356749), 2.3 miles from Portland, elevation 159 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Milwaukie, so its frost dates are the same as Portland's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Jan 24 | Feb 25 | Mar 21 |
| First frost in fall | Nov 10 | Dec 1 | Dec 27 |
Frost-free days in an average year: 280
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | Mar 29 | Nov 12 |
| Frost (32°F) | Every year | Feb 25 | Dec 1 |
| Hard freeze (28°F) | 9 years in 10 | Jan 31 | Dec 20 |
Nights at 32°F or colder in an average year: 18
What to plant now in Portland
- Swiss chardJune 1 – Nov 1Now
- Celery and celeriac plantsAug 1 – Dec 1Now
- BeetsSept 1 – Dec 15Now
- Cabbage plantsSept 1 – Dec 31Now
- Chinese cabbageSept 1 – Nov 1Now
- Collards plantsSept 1 – Dec 1Now
- EndiveSept 1 – Nov 15Now
- Florence fennelSept 1 – Nov 15Now
- GarlicSept 1 – Nov 15Now
- Head lettuce plantsSept 1 – Dec 1Now
- KaleSept 1 – Dec 1Now
- KohlrabiSept 1 – Dec 1Now
- Leaf lettuceSept 1 – Dec 1Now
- LeeksSept 1 – Nov 1Now
- Mustard greensSept 1 – Dec 1Now
- Onion seedSept 1 – Nov 1Now
- ParsleySept 1 – Dec 31Now
- ParsnipsSept 1 – Nov 15Now
- RadishesSept 1 – Dec 31Now
- RutabagaSept 1 – Nov 15Now
- SorrelSept 1 – Nov 15Now
- TurnipsSept 1 – Nov 15Now
- CarrotsSept 15 – Dec 1Now
- DandelionSept 15 – Dec 15Now
- Corn saladOct 1 – Dec 31Now
- Garden peasOct 1 – Dec 31Now
- Onion plants plantsOct 1 – Dec 31Now
- SpinachOct 1 – Dec 31Now
- Upland cressOct 1 – Dec 31Now
- Chervil and chivesNov 1 – Dec 31Soon
- Onion setsNov 1 – Dec 31Soon
- Spring planting calendar for an average last frost around February 28 Portland: February 25
- Fall planting calendar for an average first frost around November 30 Portland: December 1
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 9 mi · last frost Mar 18
- Beaverton 9 mi · last frost Apr 1
- Gresham 10 mi · last frost Mar 16
- Troutdale 12 mi · last frost Mar 26
- Hillsboro 14 mi · last frost Apr 16