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 (19912020) · 4719 ft elev.

Data from PRESTON, ID US, 6.3 miles away with 30-year NOAA record (1991-2020).

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