Beaverhead County, Montana · Frost dates
Beaverhead County frost dates.
First-frost, last-frost, and growing-season length for Beaverhead County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- —
- 20%
- —
- 50%
- —
- 80%
- —
- 90%
- —
First fall frost
- 10%
- —
- 20%
- —
- 50%
- —
- 80%
- —
- 90%
- —
28°F — killing freeze
Last spring freeze
- 10%
- 06-17
- 20%
- 06-12
- 50%
- 05-30
- 80%
- 05-17
- 90%
- 05-12
First fall freeze
- 10%
- 09-01
- 20%
- 09-04
- 50%
- 09-14
- 80%
- 09-23
- 90%
- 09-28
Growing season length (days, 28°F threshold)
- Short year
- 76
- Median
- 107
- Long year
- 139
Source NOAA station
DILLON 18 WSW, MT US
5.8 mi · 30 yrs of record (1991–2020) · 5971 ft elev.
Data from DILLON 18 WSW, MT US, 5.8 miles away with 30-year NOAA record (1991-2020).
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