Custer County, Montana · Frost dates
Custer County frost dates.
First-frost, last-frost, and growing-season length for Custer County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 06-07
- 20%
- 06-01
- 50%
- 05-22
- 80%
- 05-12
- 90%
- 05-09
First fall frost
- 10%
- 09-02
- 20%
- 09-05
- 50%
- 09-15
- 80%
- 09-27
- 90%
- 10-01
28°F — killing freeze
Last spring freeze
- 10%
- 05-28
- 20%
- 05-22
- 50%
- 05-11
- 80%
- 05-02
- 90%
- 04-28
First fall freeze
- 10%
- 09-10
- 20%
- 09-16
- 50%
- 09-25
- 80%
- 10-04
- 90%
- 10-08
Growing season length (days, 28°F threshold)
- Short year
- 105
- Median
- 137
- Long year
- 163
Source NOAA station
MIZPAH 4 NNW, MT US
12.5 mi · 30 yrs of record (1991–2020) · 2480 ft elev.
Data from MIZPAH 4 NNW, MT US, 12.5 miles away with 30-year NOAA record (1991-2020).
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