Ravalli County, Montana · Frost dates
Ravalli County frost dates.
First-frost, last-frost, and growing-season length for Ravalli County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 06-14
- 20%
- 06-07
- 50%
- 05-24
- 80%
- 05-11
- 90%
- 05-06
First fall frost
- 10%
- 09-04
- 20%
- 09-10
- 50%
- 09-23
- 80%
- 10-04
- 90%
- 10-08
28°F — killing freeze
Last spring freeze
- 10%
- 05-21
- 20%
- 05-14
- 50%
- 05-05
- 80%
- 04-28
- 90%
- 04-23
First fall freeze
- 10%
- 09-18
- 20%
- 09-24
- 50%
- 10-04
- 80%
- 10-14
- 90%
- 10-19
Growing season length (days, 28°F threshold)
- Short year
- 120
- Median
- 152
- Long year
- 179
Source NOAA station
DARBY, MT US
4.9 mi · 30 yrs of record (1991–2020) · 3880 ft elev.
Data from DARBY, MT US, 4.9 miles away with 30-year NOAA record (1991-2020).
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