Lewis and Clark County, Montana · Frost dates
Lewis and Clark County frost dates.
First-frost, last-frost, and growing-season length for Lewis and Clark County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 06-08
- 20%
- 06-01
- 50%
- 05-21
- 80%
- 05-11
- 90%
- 05-07
First fall frost
- 10%
- 08-30
- 20%
- 09-03
- 50%
- 09-15
- 80%
- 09-25
- 90%
- 09-29
28°F — killing freeze
Last spring freeze
- 10%
- 05-23
- 20%
- 05-16
- 50%
- 05-07
- 80%
- 04-30
- 90%
- 04-26
First fall freeze
- 10%
- 09-13
- 20%
- 09-19
- 50%
- 09-28
- 80%
- 10-07
- 90%
- 10-13
Growing season length (days, 28°F threshold)
- Short year
- 113
- Median
- 144
- Long year
- 170
Source NOAA station
ROGERS PASS 9 NNE, MT US
6.4 mi · 30 yrs of record (1991–2020) · 4200 ft elev.
Data from ROGERS PASS 9 NNE, MT US, 6.4 miles away with 30-year NOAA record (1991-2020).
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