Mackinac County, Michigan · Frost dates
Mackinac County frost dates.
First-frost, last-frost, and growing-season length for Mackinac County, Michigan. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 06-10
- 20%
- 06-04
- 50%
- 05-26
- 80%
- 05-17
- 90%
- 05-12
First fall frost
- 10%
- 09-13
- 20%
- 09-20
- 50%
- 09-30
- 80%
- 10-09
- 90%
- 10-13
28°F — killing freeze
Last spring freeze
- 10%
- 05-26
- 20%
- 05-20
- 50%
- 05-11
- 80%
- 05-01
- 90%
- 04-28
First fall freeze
- 10%
- 09-26
- 20%
- 10-01
- 50%
- 10-12
- 80%
- 10-23
- 90%
- 10-30
Growing season length (days, 28°F threshold)
- Short year
- 123
- Median
- 154
- Long year
- 185
Source NOAA station
ENGADINE MDOT, MI US
13.0 mi · 30 yrs of record (1991–2020) · 685 ft elev.
Data from ENGADINE MDOT, MI US, 13 miles away with 30-year NOAA record (1991-2020).
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