Big Horn County, Wyoming · Frost dates
Big Horn County frost dates.
First-frost, last-frost, and growing-season length for Big Horn County, Wyoming. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-24
- 20%
- 05-20
- 50%
- 05-11
- 80%
- 05-04
- 90%
- 04-30
First fall frost
- 10%
- 09-11
- 20%
- 09-15
- 50%
- 09-23
- 80%
- 10-02
- 90%
- 10-06
28°F — killing freeze
Last spring freeze
- 10%
- 05-15
- 20%
- 05-10
- 50%
- 05-02
- 80%
- 04-24
- 90%
- 04-19
First fall freeze
- 10%
- 09-21
- 20%
- 09-25
- 50%
- 10-03
- 80%
- 10-12
- 90%
- 10-18
Growing season length (days, 28°F threshold)
- Short year
- 129
- Median
- 154
- Long year
- 182
Source NOAA station
GREYBULL, WY US
3.8 mi · 30 yrs of record (1991–2020) · 3787 ft elev.
Data from GREYBULL, WY US, 3.8 miles away with 30-year NOAA record (1991-2020).
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