Isabella County, Michigan · Frost dates
Isabella County frost dates.
First-frost, last-frost, and growing-season length for Isabella County, Michigan. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 05-16
- 20%
- 05-10
- 50%
- 04-30
- 80%
- 04-22
- 90%
- 04-17
First fall frost
- 10%
- 10-05
- 20%
- 10-10
- 50%
- 10-20
- 80%
- 10-30
- 90%
- 11-03
28°F — killing freeze
Last spring freeze
- 10%
- 05-04
- 20%
- 04-30
- 50%
- 04-19
- 80%
- 04-09
- 90%
- 04-04
First fall freeze
- 10%
- 10-20
- 20%
- 10-25
- 50%
- 11-03
- 80%
- 11-12
- 90%
- 11-17
Growing season length (days, 28°F threshold)
- Short year
- 169
- Median
- 198
- Long year
- 227
Source NOAA station
CENTRAL MICHIGAN UNIV, MI US
5.4 mi · 30 yrs of record (1991–2020) · 795 ft elev.
Data from CENTRAL MICHIGAN UNIV, MI US, 5.4 miles away with 30-year NOAA record (1991-2020).
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