Liberty County, Montana · Frost dates
Liberty County frost dates.
First-frost, last-frost, and growing-season length for Liberty County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 06-09
- 20%
- 06-02
- 50%
- 05-24
- 80%
- 05-16
- 90%
- 05-11
First fall frost
- 10%
- 09-03
- 20%
- 09-07
- 50%
- 09-17
- 80%
- 09-24
- 90%
- 09-29
28°F — killing freeze
Last spring freeze
- 10%
- 05-26
- 20%
- 05-20
- 50%
- 05-11
- 80%
- 05-04
- 90%
- 04-30
First fall freeze
- 10%
- 09-14
- 20%
- 09-19
- 50%
- 09-26
- 80%
- 10-03
- 90%
- 10-08
Growing season length (days, 28°F threshold)
- Short year
- 111
- Median
- 138
- Long year
- 161
Source NOAA station
CHESTER, MT US
4.7 mi · 30 yrs of record (1991–2020) · 3132 ft elev.
Data from CHESTER, MT US, 4.7 miles away with 30-year NOAA record (1991-2020).
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