Silver Bow County, Montana · Frost dates
Silver Bow County frost dates.
First-frost, last-frost, and growing-season length for Silver Bow County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 07-01
- 20%
- 06-25
- 50%
- 06-13
- 80%
- 06-01
- 90%
- 05-27
First fall frost
- 10%
- 08-24
- 20%
- 08-28
- 50%
- 09-05
- 80%
- 09-14
- 90%
- 09-19
28°F — killing freeze
Last spring freeze
- 10%
- 06-10
- 20%
- 06-02
- 50%
- 05-21
- 80%
- 05-12
- 90%
- 05-08
First fall freeze
- 10%
- 09-02
- 20%
- 09-07
- 50%
- 09-17
- 80%
- 09-26
- 90%
- 10-01
Growing season length (days, 28°F threshold)
- Short year
- 84
- Median
- 119
- Long year
- 146
Source NOAA station
BUTTE BERT MOONEY AP, MT US
9.0 mi · 30 yrs of record (1991–2020) · 5506 ft elev.
Data from BUTTE BERT MOONEY AP, MT US, 9 miles away with 30-year NOAA record (1991-2020).
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