McCone County, Montana · Frost dates
McCone County frost dates.
First-frost, last-frost, and growing-season length for McCone County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 05-31
- 20%
- 05-26
- 50%
- 05-17
- 80%
- 05-08
- 90%
- 05-04
First fall frost
- 10%
- 09-07
- 20%
- 09-13
- 50%
- 09-22
- 80%
- 10-01
- 90%
- 10-06
28°F — killing freeze
Last spring freeze
- 10%
- 05-21
- 20%
- 05-16
- 50%
- 05-06
- 80%
- 04-28
- 90%
- 04-22
First fall freeze
- 10%
- 09-17
- 20%
- 09-22
- 50%
- 10-01
- 80%
- 10-11
- 90%
- 10-17
Growing season length (days, 28°F threshold)
- Short year
- 119
- Median
- 148
- Long year
- 178
Source NOAA station
CIRCLE, MT US
16.8 mi · 30 yrs of record (1991–2020) · 2480 ft elev.
Data from CIRCLE, MT US, 16.8 miles away with 30-year NOAA record (1991-2020).
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