Traill County, North Dakota · Frost dates
Traill County frost dates.
First-frost, last-frost, and growing-season length for Traill County, North Dakota. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4a
32°F — light freeze
Last spring frost
- 10%
- 05-17
- 20%
- 05-12
- 50%
- 05-02
- 80%
- 04-23
- 90%
- 04-15
First fall frost
- 10%
- 09-25
- 20%
- 09-30
- 50%
- 10-09
- 80%
- 10-20
- 90%
- 10-25
28°F — killing freeze
Last spring freeze
- 10%
- 05-08
- 20%
- 05-02
- 50%
- 04-23
- 80%
- 04-11
- 90%
- 04-06
First fall freeze
- 10%
- 10-02
- 20%
- 10-08
- 50%
- 10-20
- 80%
- 10-31
- 90%
- 11-04
Growing season length (days, 28°F threshold)
- Short year
- 147
- Median
- 180
- Long year
- 212
Source NOAA station
HILLSBORO 3 N, ND US
4.6 mi · 30 yrs of record (1991–2020) · 910 ft elev.
Data from HILLSBORO 3 N, ND US, 4.6 miles away with 30-year NOAA record (1991-2020).
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