Grand Forks County, North Dakota · Frost dates
Grand Forks County frost dates.
First-frost, last-frost, and growing-season length for Grand Forks County, North Dakota. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4a
32°F — light freeze
Last spring frost
- 10%
- 05-31
- 20%
- 05-26
- 50%
- 05-16
- 80%
- 05-07
- 90%
- 05-03
First fall frost
- 10%
- 09-15
- 20%
- 09-19
- 50%
- 09-27
- 80%
- 10-03
- 90%
- 10-08
28°F — killing freeze
Last spring freeze
- 10%
- 05-19
- 20%
- 05-14
- 50%
- 05-04
- 80%
- 04-26
- 90%
- 04-20
First fall freeze
- 10%
- 09-23
- 20%
- 09-28
- 50%
- 10-05
- 80%
- 10-14
- 90%
- 10-19
Growing season length (days, 28°F threshold)
- Short year
- 127
- Median
- 154
- Long year
- 182
Source NOAA station
GRAND FORKS INTL AP, ND US
12.4 mi · 30 yrs of record (1991–2020) · 842 ft elev.
Data from GRAND FORKS INTL AP, ND US, 12.4 miles away with 30-year NOAA record (1991-2020).
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