Last frost date in Mount Vernon, Washington
March 24
Average last frost in spring. In an early year (1 in 10) it's over by March 3; in a late year (1 in 10) it comes after April 14.
November 3
Average first frost in fall. 1 year in 10 it comes by October 12.
Source: NOAA U.S. Climate Normals 1991–2020, station Mt Vernon 3 Wnw (USC00455678), 3.8 miles from Mount Vernon, elevation 14 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Burlington, so its frost dates are the same as Mount Vernon's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Mar 3 | Mar 24 | Apr 14 |
| First frost in fall | Oct 12 | Nov 3 | Nov 25 |
Frost-free days in an average year: 224
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | Apr 18 | Oct 16 |
| Frost (32°F) | Every year | Mar 24 | Nov 3 |
| Hard freeze (28°F) | Every year | Feb 27 | Nov 25 |
Nights at 32°F or colder in an average year: 46
What to plant now in Mount Vernon
- Corn saladSept 15 – Nov 1Now
- Upland cressSept 15 – Nov 1Now
- Rhubarb plantsNov 1 – Dec 1Soon
- Asparagus plantsNov 15 – Jan 1Soon
- Spring planting calendar for an average last frost around March 20 Mount Vernon: March 24
- Fall planting calendar for an average first frost around October 30 Mount Vernon: November 3
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
- Sedro-Woolley 7 mi · last frost Mar 27
- Anacortes 15 mi · last frost Mar 8
- Oak Harbor 17 mi · last frost Mar 13
- Arlington 19 mi · last frost Apr 22
- Bellingham 24 mi · last frost Apr 1
Updated