Washington County, Idaho · Frost dates
Washington County frost dates.
First-frost, last-frost, and growing-season length for Washington County, Idaho. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 06-04
- 20%
- 05-29
- 50%
- 05-15
- 80%
- 05-03
- 90%
- 04-29
First fall frost
- 10%
- 09-12
- 20%
- 09-17
- 50%
- 09-27
- 80%
- 10-05
- 90%
- 10-09
28°F — killing freeze
Last spring freeze
- 10%
- 05-15
- 20%
- 05-08
- 50%
- 04-28
- 80%
- 04-15
- 90%
- 04-08
First fall freeze
- 10%
- 09-23
- 20%
- 09-28
- 50%
- 10-07
- 80%
- 10-17
- 90%
- 10-22
Growing season length (days, 28°F threshold)
- Short year
- 131
- Median
- 162
- Long year
- 197
Source NOAA station
CAMBRIDGE, ID US
10.5 mi · 30 yrs of record (1991–2020) · 2650 ft elev.
Data from CAMBRIDGE, ID US, 10.5 miles away with 30-year NOAA record (1991-2020).
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