Walla Walla County, Washington · Frost dates
Walla Walla County frost dates.
First-frost, last-frost, and growing-season length for Walla Walla County, Washington. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 8b
32°F — light freeze
Last spring frost
- 10%
- 04-22
- 20%
- 04-13
- 50%
- 03-27
- 80%
- 03-10
- 90%
- 03-03
First fall frost
- 10%
- 10-15
- 20%
- 10-20
- 50%
- 10-31
- 80%
- 11-11
- 90%
- 11-17
28°F — killing freeze
Last spring freeze
- 10%
- 03-27
- 20%
- 03-19
- 50%
- 03-04
- 80%
- 02-19
- 90%
- 02-09
First fall freeze
- 10%
- 10-25
- 20%
- 11-01
- 50%
- 11-14
- 80%
- 11-27
- 90%
- 12-04
Growing season length (days, 28°F threshold)
- Short year
- 212
- Median
- 255
- Long year
- 298
Source NOAA station
WALLA WALLA RGNL AP, WA US
14.4 mi · 30 yrs of record (1991–2020) · 1166 ft elev.
Data from WALLA WALLA RGNL AP, WA US, 14.4 miles away with 30-year NOAA record (1991-2020).
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