Mountrail County, North Dakota · Frost dates
Mountrail County frost dates.
First-frost, last-frost, and growing-season length for Mountrail County, North Dakota. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4a
32°F — light freeze
Last spring frost
- 10%
- 05-29
- 20%
- 05-25
- 50%
- 05-17
- 80%
- 05-10
- 90%
- 05-07
First fall frost
- 10%
- 09-12
- 20%
- 09-16
- 50%
- 09-23
- 80%
- 09-30
- 90%
- 10-03
28°F — killing freeze
Last spring freeze
- 10%
- 05-19
- 20%
- 05-15
- 50%
- 05-08
- 80%
- 05-01
- 90%
- 04-26
First fall freeze
- 10%
- 09-19
- 20%
- 09-22
- 50%
- 09-30
- 80%
- 10-10
- 90%
- 10-14
Growing season length (days, 28°F threshold)
- Short year
- 123
- Median
- 145
- Long year
- 171
Source NOAA station
STANLEY 3 NNW, ND US
10.4 mi · 30 yrs of record (1991–2020) · 2280 ft elev.
Data from STANLEY 3 NNW, ND US, 10.4 miles away with 30-year NOAA record (1991-2020).
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