Last frost date in Sammamish, Washington
March 30
Average last frost in spring. In an early year (1 in 10) it's over by March 4; in a late year (1 in 10) it comes after April 21.
November 7
Average first frost in fall. 1 year in 10 it comes by October 22.
Source: NOAA U.S. Climate Normals 1991–2020, station Snoqualmie Falls (USC00457773), 10.1 miles from Sammamish, elevation 440 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Snoqualmie, so its frost dates are the same as Sammamish's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Mar 4 | Mar 30 | Apr 21 |
| First frost in fall | Oct 22 | Nov 7 | Dec 1 |
Frost-free days in an average year: 223
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | Apr 26 | Oct 22 |
| Frost (32°F) | Every year | Mar 30 | Nov 7 |
| Hard freeze (28°F) | 10 years in 10 | Feb 27 | Nov 29 |
Nights at 32°F or colder in an average year: 54
What to plant now in Sammamish
- 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 30 Sammamish: March 30
- Fall planting calendar for an average first frost around November 10 Sammamish: November 7
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 Washington
- Mercer Island 9 mi · last frost Mar 13
- Renton 11 mi · last frost Mar 13
- Seattle 15 mi · last frost Mar 8
- Maple Valley 16 mi · last frost Apr 20
- Kent 16 mi · last frost Mar 20
Updated