Richland County, Montana · Frost dates
Richland County frost dates.
First-frost, last-frost, and growing-season length for Richland County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 05-25
- 20%
- 05-20
- 50%
- 05-11
- 80%
- 05-03
- 90%
- 04-30
First fall frost
- 10%
- 09-13
- 20%
- 09-18
- 50%
- 09-27
- 80%
- 10-05
- 90%
- 10-09
28°F — killing freeze
Last spring freeze
- 10%
- 05-16
- 20%
- 05-11
- 50%
- 05-02
- 80%
- 04-24
- 90%
- 04-18
First fall freeze
- 10%
- 09-22
- 20%
- 09-27
- 50%
- 10-06
- 80%
- 10-16
- 90%
- 10-20
Growing season length (days, 28°F threshold)
- Short year
- 129
- Median
- 157
- Long year
- 185
Source NOAA station
SIDNEY, MT US
19.7 mi · 30 yrs of record (1991–2020) · 1933 ft elev.
Data from SIDNEY, MT US, 19.7 miles away with 30-year NOAA record (1991-2020).
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