Rosebud County, Montana · Frost dates
Rosebud County frost dates.
First-frost, last-frost, and growing-season length for Rosebud County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 05-21
- 20%
- 05-17
- 50%
- 05-09
- 80%
- 05-01
- 90%
- 04-28
First fall frost
- 10%
- 09-16
- 20%
- 09-21
- 50%
- 09-29
- 80%
- 10-07
- 90%
- 10-10
28°F — killing freeze
Last spring freeze
- 10%
- 05-12
- 20%
- 05-07
- 50%
- 04-29
- 80%
- 04-19
- 90%
- 04-14
First fall freeze
- 10%
- 09-24
- 20%
- 09-29
- 50%
- 10-08
- 80%
- 10-17
- 90%
- 10-22
Growing season length (days, 28°F threshold)
- Short year
- 135
- Median
- 162
- Long year
- 191
Source NOAA station
FORSYTH, MT US
6.9 mi · 30 yrs of record (1991–2020) · 2515 ft elev.
Data from FORSYTH, MT US, 6.9 miles away with 30-year NOAA record (1991-2020).
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