Mellette County, South Dakota · Frost dates
Mellette County frost dates.
First-frost, last-frost, and growing-season length for Mellette County, South Dakota. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 05-22
- 20%
- 05-17
- 50%
- 05-06
- 80%
- 04-28
- 90%
- 04-24
First fall frost
- 10%
- 09-22
- 20%
- 09-26
- 50%
- 10-04
- 80%
- 10-14
- 90%
- 10-19
28°F — killing freeze
Last spring freeze
- 10%
- 05-12
- 20%
- 05-07
- 50%
- 04-29
- 80%
- 04-18
- 90%
- 04-13
First fall freeze
- 10%
- 09-29
- 20%
- 10-03
- 50%
- 10-14
- 80%
- 10-24
- 90%
- 10-29
Growing season length (days, 28°F threshold)
- Short year
- 140
- Median
- 168
- Long year
- 199
Source NOAA station
CEDAR BUTTE, SD US
13.2 mi · 30 yrs of record (1991–2020) · 2355 ft elev.
Data from CEDAR BUTTE, SD US, 13.2 miles away with 30-year NOAA record (1991-2020).
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