Whitman County, Washington · Frost dates
Whitman County frost dates.
First-frost, last-frost, and growing-season length for Whitman County, Washington. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 8b
32°F — light freeze
Last spring frost
- 10%
- 05-15
- 20%
- 05-09
- 50%
- 04-29
- 80%
- 04-17
- 90%
- 04-09
First fall frost
- 10%
- 09-19
- 20%
- 09-26
- 50%
- 10-04
- 80%
- 10-18
- 90%
- 10-23
28°F — killing freeze
Last spring freeze
- 10%
- 04-29
- 20%
- 04-22
- 50%
- 04-05
- 80%
- 03-21
- 90%
- 03-11
First fall freeze
- 10%
- 10-02
- 20%
- 10-07
- 50%
- 10-20
- 80%
- 11-01
- 90%
- 11-11
Growing season length (days, 28°F threshold)
- Short year
- 156
- Median
- 198
- Long year
- 245
Source NOAA station
ST JOHN, WA US
13.2 mi · 30 yrs of record (1991–2020) · 1952 ft elev.
Data from ST JOHN, WA US, 13.2 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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