Sweetwater County, Wyoming · Frost dates
Sweetwater County frost dates.
First-frost, last-frost, and growing-season length for Sweetwater County, Wyoming. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 06-09
- 20%
- 06-03
- 50%
- 05-22
- 80%
- 05-10
- 90%
- 05-05
First fall frost
- 10%
- 09-14
- 20%
- 09-20
- 50%
- 09-28
- 80%
- 10-04
- 90%
- 10-09
28°F — killing freeze
Last spring freeze
- 10%
- 05-25
- 20%
- 05-18
- 50%
- 05-07
- 80%
- 04-28
- 90%
- 04-23
First fall freeze
- 10%
- 09-22
- 20%
- 09-27
- 50%
- 10-05
- 80%
- 10-18
- 90%
- 10-23
Growing season length (days, 28°F threshold)
- Short year
- 120
- Median
- 151
- Long year
- 183
Source NOAA station
ROCK SPRINGS AP, WY US
10.2 mi · 30 yrs of record (1991–2020) · 6741 ft elev.
Data from ROCK SPRINGS AP, WY US, 10.2 miles away with 30-year NOAA record (1991-2020).
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