Deer Lodge County, Montana · Frost dates
Deer Lodge County frost dates.
First-frost, last-frost, and growing-season length for Deer Lodge County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 06-25
- 20%
- 06-17
- 50%
- 06-01
- 80%
- 05-20
- 90%
- 05-14
First fall frost
- 10%
- 08-31
- 20%
- 09-04
- 50%
- 09-14
- 80%
- 09-24
- 90%
- 10-01
28°F — killing freeze
Last spring freeze
- 10%
- 05-30
- 20%
- 05-23
- 50%
- 05-13
- 80%
- 05-03
- 90%
- 04-29
First fall freeze
- 10%
- 09-12
- 20%
- 09-17
- 50%
- 09-28
- 80%
- 10-06
- 90%
- 10-12
Growing season length (days, 28°F threshold)
- Short year
- 105
- Median
- 138
- Long year
- 166
Source NOAA station
ANACONDA, MT US
10.3 mi · 30 yrs of record (1991–2020) · 5230 ft elev.
Data from ANACONDA, MT US, 10.3 miles away with 30-year NOAA record (1991-2020).
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