Fergus County, Montana · Frost dates
Fergus County frost dates.
First-frost, last-frost, and growing-season length for Fergus County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 05-27
- 20%
- 05-22
- 50%
- 05-14
- 80%
- 05-06
- 90%
- 05-02
First fall frost
- 10%
- 09-14
- 20%
- 09-20
- 50%
- 09-28
- 80%
- 10-05
- 90%
- 10-10
28°F — killing freeze
Last spring freeze
- 10%
- 05-14
- 20%
- 05-09
- 50%
- 05-02
- 80%
- 04-23
- 90%
- 04-17
First fall freeze
- 10%
- 09-25
- 20%
- 09-28
- 50%
- 10-06
- 80%
- 10-15
- 90%
- 10-20
Growing season length (days, 28°F threshold)
- Short year
- 134
- Median
- 157
- Long year
- 186
Source NOAA station
LEWISTOWN, MT US
13.4 mi · 30 yrs of record (1991–2020) · 3911 ft elev.
Data from LEWISTOWN, MT US, 13.4 miles away with 30-year NOAA record (1991-2020).
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