Natrona County, Wyoming · Frost dates
Natrona County frost dates.
First-frost, last-frost, and growing-season length for Natrona County, Wyoming. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 06-05
- 20%
- 05-31
- 50%
- 05-23
- 80%
- 05-14
- 90%
- 05-09
First fall frost
- 10%
- 09-07
- 20%
- 09-12
- 50%
- 09-20
- 80%
- 09-29
- 90%
- 10-04
28°F — killing freeze
Last spring freeze
- 10%
- 05-23
- 20%
- 05-19
- 50%
- 05-10
- 80%
- 05-02
- 90%
- 04-28
First fall freeze
- 10%
- 09-17
- 20%
- 09-22
- 50%
- 10-01
- 80%
- 10-12
- 90%
- 10-17
Growing season length (days, 28°F threshold)
- Short year
- 117
- Median
- 144
- Long year
- 172
Source NOAA station
POWDER RIVER #2, WY US
11.8 mi · 30 yrs of record (1991–2020) · 5700 ft elev.
Data from POWDER RIVER #2, WY US, 11.8 miles away with 30-year NOAA record (1991-2020).
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