Mineral County, Montana · Frost dates
Mineral County frost dates.
First-frost, last-frost, and growing-season length for Mineral County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 06-08
- 20%
- 05-30
- 50%
- 05-17
- 80%
- 05-06
- 90%
- 05-01
First fall frost
- 10%
- 09-06
- 20%
- 09-11
- 50%
- 09-23
- 80%
- 10-02
- 90%
- 10-07
28°F — killing freeze
Last spring freeze
- 10%
- 05-19
- 20%
- 05-11
- 50%
- 05-01
- 80%
- 04-22
- 90%
- 04-16
First fall freeze
- 10%
- 09-20
- 20%
- 09-27
- 50%
- 10-06
- 80%
- 10-18
- 90%
- 10-24
Growing season length (days, 28°F threshold)
- Short year
- 124
- Median
- 158
- Long year
- 191
Source NOAA station
SUPERIOR, MT US
10.1 mi · 30 yrs of record (1991–2020) · 2710 ft elev.
Data from SUPERIOR, MT US, 10.1 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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