Iron County, Michigan · Frost dates
Iron County frost dates.
First-frost, last-frost, and growing-season length for Iron County, Michigan. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 07-07
- 20%
- 06-21
- 50%
- 06-06
- 80%
- 05-28
- 90%
- 05-23
First fall frost
- 10%
- 08-20
- 20%
- 08-29
- 50%
- 09-09
- 80%
- 09-21
- 90%
- 09-27
28°F — killing freeze
Last spring freeze
- 10%
- 06-08
- 20%
- 06-03
- 50%
- 05-24
- 80%
- 05-13
- 90%
- 05-06
First fall freeze
- 10%
- 09-07
- 20%
- 09-14
- 50%
- 09-25
- 80%
- 10-05
- 90%
- 10-09
Growing season length (days, 28°F threshold)
- Short year
- 91
- Median
- 124
- Long year
- 156
Source NOAA station
AMASA 1W, MI US
6.1 mi · 30 yrs of record (1991–2020) · 1470 ft elev.
Data from AMASA 1W, MI US, 6.1 miles away with 30-year NOAA record (1991-2020).
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