Granite County, Montana · Frost dates
Granite County frost dates.
First-frost, last-frost, and growing-season length for Granite 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%
- 06-18
- 20%
- 06-10
- 50%
- 05-29
- 80%
- 05-19
- 90%
- 05-13
First fall freeze
- 10%
- 08-28
- 20%
- 09-02
- 50%
- 09-12
- 80%
- 09-22
- 90%
- 09-27
Growing season length (days, 28°F threshold)
- Short year
- 71
- Median
- 106
- Long year
- 137
Source NOAA station
PHILLIPSBURG RS, MT US
8.2 mi · 30 yrs of record (1991–2020) · 5270 ft elev.
Data from PHILLIPSBURG RS, MT US, 8.2 miles away with 30-year NOAA record (1991-2020).
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