Alpena County, Michigan · Frost dates
Alpena County frost dates.
First-frost, last-frost, and growing-season length for Alpena 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%
- 05-17
- 50%
- 05-05
- 80%
- 04-25
- 90%
- 04-21
First fall frost
- 10%
- 09-30
- 20%
- 10-05
- 50%
- 10-17
- 80%
- 10-27
- 90%
- 11-01
28°F — killing freeze
Last spring freeze
- 10%
- 05-13
- 20%
- 05-05
- 50%
- 04-23
- 80%
- 04-13
- 90%
- 04-07
First fall freeze
- 10%
- 10-15
- 20%
- 10-21
- 50%
- 10-31
- 80%
- 11-09
- 90%
- 11-15
Growing season length (days, 28°F threshold)
- Short year
- 155
- Median
- 191
- Long year
- 222
Source NOAA station
ALPENA WWTP, MI US
11.4 mi · 30 yrs of record (1991–2020) · 590 ft elev.
Data from ALPENA WWTP, MI US, 11.4 miles away with 30-year NOAA record (1991-2020).
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