Sweet Grass County, Montana · Frost dates
Sweet Grass County frost dates.
First-frost, last-frost, and growing-season length for Sweet Grass 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%
- 05-23
- 50%
- 05-14
- 80%
- 05-06
- 90%
- 05-02
First fall frost
- 10%
- 09-10
- 20%
- 09-16
- 50%
- 09-26
- 80%
- 10-03
- 90%
- 10-08
28°F — killing freeze
Last spring freeze
- 10%
- 05-16
- 20%
- 05-10
- 50%
- 05-02
- 80%
- 04-24
- 90%
- 04-18
First fall freeze
- 10%
- 09-22
- 20%
- 09-27
- 50%
- 10-05
- 80%
- 10-16
- 90%
- 10-21
Growing season length (days, 28°F threshold)
- Short year
- 129
- Median
- 156
- Long year
- 186
Source NOAA station
BIG TIMBER, MT US
1.5 mi · 30 yrs of record (1991–2020) · 4100 ft elev.
Data from BIG TIMBER, MT US, 1.5 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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