Lake County, Montana · Frost dates
Lake County frost dates.
First-frost, last-frost, and growing-season length for Lake County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 05-26
- 20%
- 05-21
- 50%
- 05-10
- 80%
- 05-01
- 90%
- 04-27
First fall frost
- 10%
- 09-22
- 20%
- 09-28
- 50%
- 10-05
- 80%
- 10-15
- 90%
- 10-19
28°F — killing freeze
Last spring freeze
- 10%
- 05-13
- 20%
- 05-07
- 50%
- 04-28
- 80%
- 04-14
- 90%
- 04-07
First fall freeze
- 10%
- 10-01
- 20%
- 10-05
- 50%
- 10-16
- 80%
- 10-25
- 90%
- 11-01
Growing season length (days, 28°F threshold)
- Short year
- 141
- Median
- 171
- Long year
- 208
Source NOAA station
POLSON, MT US
5.4 mi · 30 yrs of record (1991–2020) · 3010 ft elev.
Data from POLSON, MT US, 5.4 miles away with 30-year NOAA record (1991-2020).
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