Keweenaw County, Michigan · Frost dates
Keweenaw County frost dates.
First-frost, last-frost, and growing-season length for Keweenaw County, Michigan. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 06-03
- 20%
- 05-30
- 50%
- 05-17
- 80%
- 05-05
- 90%
- 05-01
First fall frost
- 10%
- 09-16
- 20%
- 09-22
- 50%
- 10-01
- 80%
- 10-11
- 90%
- 10-18
28°F — killing freeze
Last spring freeze
- 10%
- 05-20
- 20%
- 05-15
- 50%
- 05-02
- 80%
- 04-24
- 90%
- 04-19
First fall freeze
- 10%
- 09-28
- 20%
- 10-03
- 50%
- 10-14
- 80%
- 10-26
- 90%
- 11-01
Growing season length (days, 28°F threshold)
- Short year
- 131
- Median
- 165
- Long year
- 196
Source NOAA station
HANCOCK HOUGHTON CO AP, MI US
15.2 mi · 30 yrs of record (1991–2020) · 1095 ft elev.
Data from HANCOCK HOUGHTON CO AP, MI US, 15.2 miles away with 30-year NOAA record (1991-2020).
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