Yellowstone County, Montana · Frost dates
Yellowstone County frost dates.
First-frost, last-frost, and growing-season length for Yellowstone 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%
- 05-20
- 50%
- 05-12
- 80%
- 05-05
- 90%
- 04-30
First fall frost
- 10%
- 09-13
- 20%
- 09-18
- 50%
- 09-25
- 80%
- 10-04
- 90%
- 10-08
28°F — killing freeze
Last spring freeze
- 10%
- 05-14
- 20%
- 05-09
- 50%
- 04-30
- 80%
- 04-22
- 90%
- 04-15
First fall freeze
- 10%
- 09-23
- 20%
- 09-26
- 50%
- 10-04
- 80%
- 10-14
- 90%
- 10-18
Growing season length (days, 28°F threshold)
- Short year
- 132
- Median
- 157
- Long year
- 186
Source NOAA station
HUNTLEY EXP STN, MT US
1.8 mi · 30 yrs of record (1991–2020) · 3034 ft elev.
Data from HUNTLEY EXP STN, MT US, 1.8 miles away with 30-year NOAA record (1991-2020).
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