Custer County, Idaho · Frost dates
Custer County frost dates.
First-frost, last-frost, and growing-season length for Custer County, Idaho. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 06-02
- 20%
- 05-26
- 50%
- 05-14
- 80%
- 05-05
- 90%
- 05-02
First fall frost
- 10%
- 09-10
- 20%
- 09-16
- 50%
- 09-25
- 80%
- 10-03
- 90%
- 10-07
28°F — killing freeze
Last spring freeze
- 10%
- 05-12
- 20%
- 05-09
- 50%
- 05-01
- 80%
- 04-23
- 90%
- 04-19
First fall freeze
- 10%
- 09-24
- 20%
- 09-28
- 50%
- 10-07
- 80%
- 10-17
- 90%
- 10-21
Growing season length (days, 28°F threshold)
- Short year
- 135
- Median
- 159
- Long year
- 185
Source NOAA station
CHALLIS AP, ID US
17.3 mi · 30 yrs of record (1991–2020) · 5033 ft elev.
Data from CHALLIS AP, ID US, 17.3 miles away with 30-year NOAA record (1991-2020).
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