Mercer County, North Dakota · Frost dates
Mercer County frost dates.
First-frost, last-frost, and growing-season length for Mercer 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%
- 05-30
- 50%
- 05-21
- 80%
- 05-12
- 90%
- 05-07
First fall frost
- 10%
- 09-05
- 20%
- 09-10
- 50%
- 09-20
- 80%
- 09-29
- 90%
- 10-04
28°F — killing freeze
Last spring freeze
- 10%
- 05-25
- 20%
- 05-20
- 50%
- 05-11
- 80%
- 05-01
- 90%
- 04-27
First fall freeze
- 10%
- 09-14
- 20%
- 09-19
- 50%
- 09-28
- 80%
- 10-08
- 90%
- 10-14
Growing season length (days, 28°F threshold)
- Short year
- 112
- Median
- 140
- Long year
- 170
Source NOAA station
BEULAH 1 W, ND US
3.7 mi · 30 yrs of record (1991–2020) · 1785 ft elev.
Data from BEULAH 1 W, ND US, 3.7 miles away with 30-year NOAA record (1991-2020).
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