Mahnomen County, Minnesota · Frost dates
Mahnomen County frost dates.
First-frost, last-frost, and growing-season length for Mahnomen County, Minnesota. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4a
32°F — light freeze
Last spring frost
- 10%
- 05-24
- 20%
- 05-18
- 50%
- 05-07
- 80%
- 04-30
- 90%
- 04-27
First fall frost
- 10%
- 09-15
- 20%
- 09-19
- 50%
- 09-28
- 80%
- 10-07
- 90%
- 10-13
28°F — killing freeze
Last spring freeze
- 10%
- 05-12
- 20%
- 05-07
- 50%
- 04-29
- 80%
- 04-20
- 90%
- 04-15
First fall freeze
- 10%
- 09-23
- 20%
- 09-29
- 50%
- 10-08
- 80%
- 10-19
- 90%
- 10-25
Growing season length (days, 28°F threshold)
- Short year
- 134
- Median
- 162
- Long year
- 193
Source NOAA station
MAHNOMEN, MN US
7.4 mi · 30 yrs of record (1991–2020) · 1212 ft elev.
Data from MAHNOMEN, MN US, 7.4 miles away with 30-year NOAA record (1991-2020).
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