Cascade County, Montana · Frost dates
Cascade County frost dates.
First-frost, last-frost, and growing-season length for Cascade 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%
- 05-21
- 50%
- 05-12
- 80%
- 05-04
- 90%
- 04-30
First fall frost
- 10%
- 09-14
- 20%
- 09-19
- 50%
- 09-28
- 80%
- 10-07
- 90%
- 10-11
28°F — killing freeze
Last spring freeze
- 10%
- 05-13
- 20%
- 05-08
- 50%
- 04-30
- 80%
- 04-20
- 90%
- 04-14
First fall freeze
- 10%
- 09-26
- 20%
- 09-30
- 50%
- 10-08
- 80%
- 10-18
- 90%
- 10-23
Growing season length (days, 28°F threshold)
- Short year
- 136
- Median
- 161
- Long year
- 192
Source NOAA station
GREAT FALLS WFO, MT US
10.1 mi · 30 yrs of record (1991–2020) · 3705 ft elev.
Data from GREAT FALLS WFO, MT US, 10.1 miles away with 30-year NOAA record (1991-2020).
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