Roscommon County, Michigan · Frost dates
Roscommon County frost dates.
First-frost, last-frost, and growing-season length for Roscommon County, Michigan. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 06-03
- 20%
- 05-30
- 50%
- 05-19
- 80%
- 05-06
- 90%
- 04-30
First fall frost
- 10%
- 09-06
- 20%
- 09-13
- 50%
- 09-23
- 80%
- 10-03
- 90%
- 10-07
28°F — killing freeze
Last spring freeze
- 10%
- 05-24
- 20%
- 05-18
- 50%
- 05-04
- 80%
- 04-23
- 90%
- 04-17
First fall freeze
- 10%
- 09-21
- 20%
- 09-26
- 50%
- 10-05
- 80%
- 10-19
- 90%
- 10-25
Growing season length (days, 28°F threshold)
- Short year
- 120
- Median
- 154
- Long year
- 191
Source NOAA station
HOUGHTON LK ROSCOMMON AP, MI US
3.4 mi · 30 yrs of record (1991–2020) · 1151 ft elev.
Data from HOUGHTON LK ROSCOMMON AP, MI US, 3.4 miles away with 30-year NOAA record (1991-2020).
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