Missoula County, Montana · Frost dates
Missoula County frost dates.
First-frost, last-frost, and growing-season length for Missoula County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 05-28
- 20%
- 05-22
- 50%
- 05-10
- 80%
- 05-02
- 90%
- 04-27
First fall frost
- 10%
- 09-16
- 20%
- 09-22
- 50%
- 10-01
- 80%
- 10-10
- 90%
- 10-15
28°F — killing freeze
Last spring freeze
- 10%
- 05-11
- 20%
- 05-06
- 50%
- 04-28
- 80%
- 04-17
- 90%
- 04-12
First fall freeze
- 10%
- 09-28
- 20%
- 10-02
- 50%
- 10-12
- 80%
- 10-21
- 90%
- 10-25
Growing season length (days, 28°F threshold)
- Short year
- 140
- Median
- 167
- Long year
- 196
Source NOAA station
MISSOULA 2 NE, MT US
9.6 mi · 30 yrs of record (1991–2020) · 3420 ft elev.
Data from MISSOULA 2 NE, MT US, 9.6 miles away with 30-year NOAA record (1991-2020).
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