Clearwater County, Idaho · Frost dates
Clearwater County frost dates.
First-frost, last-frost, and growing-season length for Clearwater County, Idaho. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- —
- 20%
- —
- 50%
- —
- 80%
- —
- 90%
- —
First fall frost
- 10%
- —
- 20%
- —
- 50%
- —
- 80%
- —
- 90%
- —
28°F — killing freeze
Last spring freeze
- 10%
- 06-07
- 20%
- 05-30
- 50%
- 05-17
- 80%
- 05-08
- 90%
- 05-05
First fall freeze
- 10%
- 09-01
- 20%
- 09-07
- 50%
- 09-20
- 80%
- 10-01
- 90%
- 10-05
Growing season length (days, 28°F threshold)
- Short year
- 86
- Median
- 126
- Long year
- 153
Source NOAA station
HEADQUARTERS, ID US
7.9 mi · 30 yrs of record (1991–2020) · 3200 ft elev.
Data from HEADQUARTERS, ID US, 7.9 miles away with 30-year NOAA record (1991-2020).
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