Powder River County, Montana · Frost dates
Powder River County frost dates.
First-frost, last-frost, and growing-season length for Powder River County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 05-29
- 20%
- 05-24
- 50%
- 05-16
- 80%
- 05-06
- 90%
- 05-02
First fall frost
- 10%
- 09-13
- 20%
- 09-19
- 50%
- 09-28
- 80%
- 10-07
- 90%
- 10-11
28°F — killing freeze
Last spring freeze
- 10%
- 05-18
- 20%
- 05-13
- 50%
- 05-03
- 80%
- 04-24
- 90%
- 04-19
First fall freeze
- 10%
- 09-23
- 20%
- 09-28
- 50%
- 10-07
- 80%
- 10-17
- 90%
- 10-21
Growing season length (days, 28°F threshold)
- Short year
- 128
- Median
- 157
- Long year
- 185
Source NOAA station
BROADUS, MT US
7.6 mi · 30 yrs of record (1991–2020) · 3032 ft elev.
Data from BROADUS, MT US, 7.6 miles away with 30-year NOAA record (1991-2020).
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