Lemhi County, Idaho · Frost dates
Lemhi County frost dates.
First-frost, last-frost, and growing-season length for Lemhi County, Idaho. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 06-09
- 20%
- 05-31
- 50%
- 05-17
- 80%
- 05-07
- 90%
- 05-03
First fall frost
- 10%
- 09-09
- 20%
- 09-15
- 50%
- 09-24
- 80%
- 10-02
- 90%
- 10-05
28°F — killing freeze
Last spring freeze
- 10%
- 05-19
- 20%
- 05-11
- 50%
- 05-02
- 80%
- 04-24
- 90%
- 04-19
First fall freeze
- 10%
- 09-21
- 20%
- 09-26
- 50%
- 10-05
- 80%
- 10-14
- 90%
- 10-18
Growing season length (days, 28°F threshold)
- Short year
- 125
- Median
- 156
- Long year
- 182
Source NOAA station
SALMON-KSRA, ID US
16.9 mi · 30 yrs of record (1991–2020) · 3953 ft elev.
Data from SALMON-KSRA, ID US, 16.9 miles away with 30-year NOAA record (1991-2020).
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