Ionia County, Michigan · Frost dates
Ionia County frost dates.
First-frost, last-frost, and growing-season length for Ionia County, Michigan. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 05-21
- 20%
- 05-15
- 50%
- 05-03
- 80%
- 04-23
- 90%
- 04-17
First fall frost
- 10%
- 09-29
- 20%
- 10-03
- 50%
- 10-12
- 80%
- 10-22
- 90%
- 10-27
28°F — killing freeze
Last spring freeze
- 10%
- 05-09
- 20%
- 05-03
- 50%
- 04-22
- 80%
- 04-12
- 90%
- 04-07
First fall freeze
- 10%
- 10-07
- 20%
- 10-15
- 50%
- 10-27
- 80%
- 11-05
- 90%
- 11-10
Growing season length (days, 28°F threshold)
- Short year
- 151
- Median
- 188
- Long year
- 217
Source NOAA station
IONIA 2SSW, MI US
0.6 mi · 30 yrs of record (1991–2020) · 805 ft elev.
Data from IONIA 2SSW, MI US, 0.6 miles away with 30-year NOAA record (1991-2020).
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