Franklin County, Idaho · Frost dates
Franklin County frost dates.
First-frost, last-frost, and growing-season length for Franklin 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%
- 05-28
- 50%
- 05-16
- 80%
- 05-06
- 90%
- 05-02
First fall frost
- 10%
- 09-14
- 20%
- 09-19
- 50%
- 09-28
- 80%
- 10-07
- 90%
- 10-14
28°F — killing freeze
Last spring freeze
- 10%
- 05-13
- 20%
- 05-08
- 50%
- 04-30
- 80%
- 04-19
- 90%
- 04-13
First fall freeze
- 10%
- 09-26
- 20%
- 10-01
- 50%
- 10-10
- 80%
- 10-21
- 90%
- 10-26
Growing season length (days, 28°F threshold)
- Short year
- 136
- Median
- 163
- Long year
- 196
Source NOAA station
PRESTON, ID US
6.3 mi · 30 yrs of record (1991–2020) · 4719 ft elev.
Data from PRESTON, ID US, 6.3 miles away with 30-year NOAA record (1991-2020).
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