Chouteau County, Montana · Frost dates
Chouteau County frost dates.
First-frost, last-frost, and growing-season length for Chouteau County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 06-03
- 20%
- 05-29
- 50%
- 05-20
- 80%
- 05-12
- 90%
- 05-08
First fall frost
- 10%
- 09-04
- 20%
- 09-09
- 50%
- 09-19
- 80%
- 09-27
- 90%
- 10-02
28°F — killing freeze
Last spring freeze
- 10%
- 05-21
- 20%
- 05-17
- 50%
- 05-09
- 80%
- 04-30
- 90%
- 04-25
First fall freeze
- 10%
- 09-16
- 20%
- 09-21
- 50%
- 09-29
- 80%
- 10-06
- 90%
- 10-11
Growing season length (days, 28°F threshold)
- Short year
- 118
- Median
- 143
- Long year
- 169
Source NOAA station
LOMA, MT US
4.6 mi · 30 yrs of record (1991–2020) · 2578 ft elev.
Data from LOMA, MT US, 4.6 miles away with 30-year NOAA record (1991-2020).
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