Carter County, Montana · Frost dates
Carter County frost dates.
First-frost, last-frost, and growing-season length for Carter County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 06-01
- 20%
- 05-27
- 50%
- 05-17
- 80%
- 05-09
- 90%
- 05-05
First fall frost
- 10%
- 09-05
- 20%
- 09-11
- 50%
- 09-22
- 80%
- 10-01
- 90%
- 10-05
28°F — killing freeze
Last spring freeze
- 10%
- 05-21
- 20%
- 05-15
- 50%
- 05-06
- 80%
- 04-28
- 90%
- 04-23
First fall freeze
- 10%
- 09-15
- 20%
- 09-22
- 50%
- 10-01
- 80%
- 10-10
- 90%
- 10-15
Growing season length (days, 28°F threshold)
- Short year
- 117
- Median
- 148
- Long year
- 175
Source NOAA station
RIDGEWAY 1 S, MT US
3.4 mi · 30 yrs of record (1991–2020) · 3316 ft elev.
Data from RIDGEWAY 1 S, MT US, 3.4 miles away with 30-year NOAA record (1991-2020).
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