Last frost date in Kennewick, Washington
March 28
Average last frost in spring. In an early year (1 in 10) it's over by March 9; in a late year (1 in 10) it comes after April 10.
October 30
Average first frost in fall. 1 year in 10 it comes by October 18.
Source: NOAA U.S. Climate Normals 1991–2020, station Kennewick (USC00454154), 3.7 miles from Kennewick, elevation 390 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Mar 9 | Mar 28 | Apr 10 |
| First frost in fall | Oct 18 | Oct 30 | Nov 15 |
Frost-free days in an average year: 216
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | Apr 14 | Oct 21 |
| Frost (32°F) | Every year | Mar 28 | Oct 30 |
| Hard freeze (28°F) | Every year | Mar 8 | Nov 11 |
Nights at 32°F or colder in an average year: 76
What to plant now in Kennewick
- 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 30 Kennewick: March 28
- Fall planting calendar for an average first frost around October 30 Kennewick: October 30
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
- Pasco 5 mi · last frost Apr 27
- Richland 8 mi · last frost Apr 6
- Sunnyside 40 mi · last frost May 1
- Walla Walla 41 mi · last frost Mar 27
- Moses Lake 64 mi · last frost Apr 27
Updated