Niobrara County, Wyoming · Frost dates
Niobrara County frost dates.
First-frost, last-frost, and growing-season length for Niobrara County, Wyoming. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 06-03
- 20%
- 05-29
- 50%
- 05-17
- 80%
- 05-09
- 90%
- 05-05
First fall frost
- 10%
- 09-09
- 20%
- 09-14
- 50%
- 09-25
- 80%
- 10-04
- 90%
- 10-08
28°F — killing freeze
Last spring freeze
- 10%
- 05-19
- 20%
- 05-14
- 50%
- 05-05
- 80%
- 04-28
- 90%
- 04-23
First fall freeze
- 10%
- 09-20
- 20%
- 09-27
- 50%
- 10-05
- 80%
- 10-14
- 90%
- 10-19
Growing season length (days, 28°F threshold)
- Short year
- 124
- Median
- 153
- Long year
- 179
Source NOAA station
LANCE CREEK 11NNE, WY US
10.8 mi · 30 yrs of record (1991–2020) · 4204 ft elev.
Data from LANCE CREEK 11NNE, WY US, 10.8 miles away with 30-year NOAA record (1991-2020).
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