Teton County, Montana · Frost dates
Teton County frost dates.
First-frost, last-frost, and growing-season length for Teton County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 06-20
- 20%
- 06-10
- 50%
- 05-28
- 80%
- 05-19
- 90%
- 05-15
First fall frost
- 10%
- 08-30
- 20%
- 09-03
- 50%
- 09-12
- 80%
- 09-21
- 90%
- 09-27
28°F — killing freeze
Last spring freeze
- 10%
- 05-27
- 20%
- 05-23
- 50%
- 05-14
- 80%
- 05-05
- 90%
- 05-01
First fall freeze
- 10%
- 09-09
- 20%
- 09-16
- 50%
- 09-25
- 80%
- 10-03
- 90%
- 10-07
Growing season length (days, 28°F threshold)
- Short year
- 105
- Median
- 134
- Long year
- 159
Source NOAA station
CHOTEAU, MT US
4.2 mi · 30 yrs of record (1991–2020) · 3845 ft elev.
Data from CHOTEAU, MT US, 4.2 miles away with 30-year NOAA record (1991-2020).
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