Last frost date in Maple Valley, Washington
April 20
Average last frost in spring. In an early year (1 in 10) it's over by March 31; in a late year (1 in 10) it comes after May 10.
October 25
Average first frost in fall. 1 year in 10 it comes by October 5.
Source: NOAA U.S. Climate Normals 1991–2020, station Landsburg (USC00454486), 3.5 miles from Maple Valley, elevation 535 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Covington, so its frost dates are the same as Maple Valley's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Mar 31 | Apr 20 | May 10 |
| First frost in fall | Oct 5 | Oct 25 | Nov 12 |
Frost-free days in an average year: 187
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 10 | Oct 6 |
| Frost (32°F) | Every year | Apr 20 | Oct 25 |
| Hard freeze (28°F) | Every year | Mar 24 | Nov 12 |
Nights at 32°F or colder in an average year: 70
What to plant now in Maple Valley
- Spring planting calendar for an average last frost around April 20 Maple Valley: April 20
- Fall planting calendar for an average first frost around October 20 Maple Valley: October 25
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
Updated