Broadwater County, Montana · Frost dates
Broadwater County frost dates.
First-frost, last-frost, and growing-season length for Broadwater County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 06-02
- 20%
- 05-28
- 50%
- 05-19
- 80%
- 05-11
- 90%
- 05-08
First fall frost
- 10%
- 09-05
- 20%
- 09-10
- 50%
- 09-19
- 80%
- 09-29
- 90%
- 10-02
28°F — killing freeze
Last spring freeze
- 10%
- 05-20
- 20%
- 05-15
- 50%
- 05-07
- 80%
- 04-30
- 90%
- 04-26
First fall freeze
- 10%
- 09-17
- 20%
- 09-22
- 50%
- 10-01
- 80%
- 10-09
- 90%
- 10-14
Growing season length (days, 28°F threshold)
- Short year
- 120
- Median
- 147
- Long year
- 171
Source NOAA station
TOWNSEND 3SE, MT US
3.0 mi · 30 yrs of record (1991–2020) · 3964 ft elev.
Data from TOWNSEND 3SE, MT US, 3 miles away with 30-year NOAA record (1991-2020).
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