Big Horn County, Montana · Frost dates
Big Horn County frost dates.
First-frost, last-frost, and growing-season length for Big Horn County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 06-02
- 20%
- 05-29
- 50%
- 05-21
- 80%
- 05-13
- 90%
- 05-09
First fall frost
- 10%
- 09-05
- 20%
- 09-09
- 50%
- 09-17
- 80%
- 09-26
- 90%
- 10-01
28°F — killing freeze
Last spring freeze
- 10%
- 05-24
- 20%
- 05-19
- 50%
- 05-10
- 80%
- 04-30
- 90%
- 04-27
First fall freeze
- 10%
- 09-15
- 20%
- 09-19
- 50%
- 09-28
- 80%
- 10-05
- 90%
- 10-09
Growing season length (days, 28°F threshold)
- Short year
- 114
- Median
- 141
- Long year
- 165
Source NOAA station
WYOLA 1 SW, MT US
20.5 mi · 30 yrs of record (1991–2020) · 3730 ft elev.
Data from WYOLA 1 SW, MT US, 20.5 miles away with 30-year NOAA record (1991-2020).
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