Morton County, North Dakota · Frost dates
Morton County frost dates.
First-frost, last-frost, and growing-season length for Morton County, North Dakota. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4a
32°F — light freeze
Last spring frost
- 10%
- 06-01
- 20%
- 05-27
- 50%
- 05-17
- 80%
- 05-09
- 90%
- 05-06
First fall frost
- 10%
- 09-06
- 20%
- 09-12
- 50%
- 09-21
- 80%
- 09-30
- 90%
- 10-04
28°F — killing freeze
Last spring freeze
- 10%
- 05-23
- 20%
- 05-17
- 50%
- 05-08
- 80%
- 04-30
- 90%
- 04-26
First fall freeze
- 10%
- 09-12
- 20%
- 09-19
- 50%
- 09-30
- 80%
- 10-10
- 90%
- 10-15
Growing season length (days, 28°F threshold)
- Short year
- 112
- Median
- 145
- Long year
- 172
Source NOAA station
ALMONT, ND US
9.3 mi · 30 yrs of record (1991–2020) · 1915 ft elev.
Data from ALMONT, ND US, 9.3 miles away with 30-year NOAA record (1991-2020).
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