Iosco County, Michigan · Frost dates
Iosco County frost dates.
First-frost, last-frost, and growing-season length for Iosco County, Michigan. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 05-26
- 20%
- 05-19
- 50%
- 05-08
- 80%
- 04-30
- 90%
- 04-26
First fall frost
- 10%
- 09-23
- 20%
- 09-28
- 50%
- 10-05
- 80%
- 10-13
- 90%
- 10-17
28°F — killing freeze
Last spring freeze
- 10%
- 05-13
- 20%
- 05-08
- 50%
- 04-28
- 80%
- 04-18
- 90%
- 04-13
First fall freeze
- 10%
- 10-02
- 20%
- 10-07
- 50%
- 10-17
- 80%
- 10-28
- 90%
- 11-01
Growing season length (days, 28°F threshold)
- Short year
- 142
- Median
- 172
- Long year
- 202
Source NOAA station
E TAWAS, MI US
9.4 mi · 30 yrs of record (1991–2020) · 586 ft elev.
Data from E TAWAS, MI US, 9.4 miles away with 30-year NOAA record (1991-2020).
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