Cook County, Minnesota · Frost dates
Cook County frost dates.
First-frost, last-frost, and growing-season length for Cook County, Minnesota. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4a
32°F — light freeze
Last spring frost
- 10%
- 06-18
- 20%
- 06-10
- 50%
- 05-22
- 80%
- 05-08
- 90%
- 05-03
First fall frost
- 10%
- 09-25
- 20%
- 09-30
- 50%
- 10-09
- 80%
- 10-19
- 90%
- 10-25
28°F — killing freeze
Last spring freeze
- 10%
- 06-08
- 20%
- 05-29
- 50%
- 05-04
- 80%
- 04-24
- 90%
- 04-19
First fall freeze
- 10%
- 10-06
- 20%
- 10-12
- 50%
- 10-24
- 80%
- 11-03
- 90%
- 11-08
Growing season length (days, 28°F threshold)
- Short year
- 120
- Median
- 173
- Long year
- 203
Source NOAA station
GRAND MARAIS, MN US
0.8 mi · 30 yrs of record (1991–2020) · 610 ft elev.
Data from GRAND MARAIS, MN US, 0.8 miles away with 30-year NOAA record (1991-2020).
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