Last frost date in Sunnyside, Washington
May 1
Average last frost in spring. In an early year (1 in 10) it's over by April 16; in a late year (1 in 10) it comes after May 18.
October 6
Average first frost in fall. 1 year in 10 it comes by September 25.
Source: NOAA U.S. Climate Normals 1991–2020, station Sunnyside (USC00458207), 0.6 miles from Sunnyside, elevation 747 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Grandview, so its frost dates are the same as Sunnyside's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 16 | May 1 | May 18 |
| First frost in fall | Sept 25 | Oct 6 | Oct 22 |
Frost-free days in an average year: 157
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 16 | Sept 25 |
| Frost (32°F) | Every year | May 1 | Oct 6 |
| Hard freeze (28°F) | Every year | Apr 15 | Oct 19 |
Nights at 32°F or colder in an average year: 124
What to plant now in Sunnyside
- Spring planting calendar for an average last frost around April 30 Sunnyside: May 1
- Fall planting calendar for an average first frost around October 10 Sunnyside: October 6
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
- Yakima 32 mi · last frost Apr 8
- Richland 34 mi · last frost Apr 6
- Kennewick 40 mi · last frost Mar 28
- Pasco 42 mi · last frost Apr 27
- Ellensburg 54 mi · last frost May 8
Updated