Pennington County, Minnesota · Frost dates
Pennington County frost dates.
First-frost, last-frost, and growing-season length for Pennington County, Minnesota. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4a
32°F — light freeze
Last spring frost
- 10%
- 05-29
- 20%
- 05-24
- 50%
- 05-14
- 80%
- 05-06
- 90%
- 05-02
First fall frost
- 10%
- 09-14
- 20%
- 09-20
- 50%
- 09-28
- 80%
- 10-06
- 90%
- 10-11
28°F — killing freeze
Last spring freeze
- 10%
- 05-20
- 20%
- 05-14
- 50%
- 05-05
- 80%
- 04-26
- 90%
- 04-21
First fall freeze
- 10%
- 09-24
- 20%
- 09-28
- 50%
- 10-08
- 80%
- 10-19
- 90%
- 10-25
Growing season length (days, 28°F threshold)
- Short year
- 127
- Median
- 156
- Long year
- 187
Source NOAA station
THIEF RVR FALLS 2, MN US
8.0 mi · 30 yrs of record (1991–2020) · 1128 ft elev.
Data from THIEF RVR FALLS 2, MN US, 8 miles away with 30-year NOAA record (1991-2020).
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