Glacier County, Montana · Frost dates
Glacier County frost dates.
First-frost, last-frost, and growing-season length for Glacier County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 07-03
- 20%
- 06-25
- 50%
- 06-12
- 80%
- 06-01
- 90%
- 05-27
First fall frost
- 10%
- 08-18
- 20%
- 08-25
- 50%
- 09-05
- 80%
- 09-16
- 90%
- 09-21
28°F — killing freeze
Last spring freeze
- 10%
- 06-07
- 20%
- 05-30
- 50%
- 05-19
- 80%
- 05-10
- 90%
- 05-06
First fall freeze
- 10%
- 09-01
- 20%
- 09-08
- 50%
- 09-20
- 80%
- 09-30
- 90%
- 10-04
Growing season length (days, 28°F threshold)
- Short year
- 86
- Median
- 124
- Long year
- 151
Source NOAA station
ST MARY, MT US
20.1 mi · 30 yrs of record (1991–2020) · 4560 ft elev.
Data from ST MARY, MT US, 20.1 miles away with 30-year NOAA record (1991-2020).
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