Koochiching County, Minnesota · Frost dates
Koochiching County frost dates.
First-frost, last-frost, and growing-season length for Koochiching County, Minnesota. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4a
32°F — light freeze
Last spring frost
- 10%
- 06-06
- 20%
- 06-01
- 50%
- 05-24
- 80%
- 05-13
- 90%
- 05-06
First fall frost
- 10%
- 09-06
- 20%
- 09-12
- 50%
- 09-20
- 80%
- 09-28
- 90%
- 10-03
28°F — killing freeze
Last spring freeze
- 10%
- 05-28
- 20%
- 05-23
- 50%
- 05-10
- 80%
- 04-30
- 90%
- 04-27
First fall freeze
- 10%
- 09-17
- 20%
- 09-22
- 50%
- 10-01
- 80%
- 10-11
- 90%
- 10-16
Growing season length (days, 28°F threshold)
- Short year
- 112
- Median
- 144
- Long year
- 172
Source NOAA station
BIG FALLS, MN US
3.4 mi · 30 yrs of record (1991–2020) · 1220 ft elev.
Data from BIG FALLS, MN US, 3.4 miles away with 30-year NOAA record (1991-2020).
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