Williams County, North Dakota · Frost dates
Williams County frost dates.
First-frost, last-frost, and growing-season length for Williams County, North Dakota. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4a
32°F — light freeze
Last spring frost
- 10%
- 06-03
- 20%
- 05-29
- 50%
- 05-21
- 80%
- 05-13
- 90%
- 05-08
First fall frost
- 10%
- 09-09
- 20%
- 09-13
- 50%
- 09-21
- 80%
- 09-28
- 90%
- 10-02
28°F — killing freeze
Last spring freeze
- 10%
- 05-25
- 20%
- 05-20
- 50%
- 05-11
- 80%
- 05-03
- 90%
- 04-29
First fall freeze
- 10%
- 09-16
- 20%
- 09-20
- 50%
- 09-28
- 80%
- 10-06
- 90%
- 10-11
Growing season length (days, 28°F threshold)
- Short year
- 114
- Median
- 140
- Long year
- 165
Source NOAA station
WILLISTON SLOULIN INTL AP, ND US
14.0 mi · 30 yrs of record (1991–2020) · 1902 ft elev.
Data from WILLISTON SLOULIN INTL AP, ND US, 14 miles away with 30-year NOAA record (1991-2020).
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