St. Clair County, Michigan · Frost dates
St. Clair County frost dates.
First-frost, last-frost, and growing-season length for St. Clair County, Michigan. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 05-17
- 20%
- 05-11
- 50%
- 05-01
- 80%
- 04-22
- 90%
- 04-18
First fall frost
- 10%
- 10-04
- 20%
- 10-09
- 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%
- 04-10
- 90%
- 04-05
First fall freeze
- 10%
- 10-17
- 20%
- 10-22
- 50%
- 11-01
- 80%
- 11-09
- 90%
- 11-14
Growing season length (days, 28°F threshold)
- Short year
- 166
- Median
- 196
- Long year
- 223
Source NOAA station
RICHMOND 4 NNW, MI US
7.3 mi · 30 yrs of record (1991–2020) · 765 ft elev.
Data from RICHMOND 4 NNW, MI US, 7.3 miles away with 30-year NOAA record (1991-2020).
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