Dewey County, South Dakota · Frost dates
Dewey County frost dates.
First-frost, last-frost, and growing-season length for Dewey County, South Dakota. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 05-23
- 20%
- 05-18
- 50%
- 05-10
- 80%
- 05-02
- 90%
- 04-29
First fall frost
- 10%
- 09-17
- 20%
- 09-21
- 50%
- 09-30
- 80%
- 10-08
- 90%
- 10-13
28°F — killing freeze
Last spring freeze
- 10%
- 05-12
- 20%
- 05-08
- 50%
- 04-30
- 80%
- 04-21
- 90%
- 04-15
First fall freeze
- 10%
- 09-22
- 20%
- 09-28
- 50%
- 10-07
- 80%
- 10-16
- 90%
- 10-20
Growing season length (days, 28°F threshold)
- Short year
- 133
- Median
- 160
- Long year
- 188
Source NOAA station
TIMBER LAKE, SD US
22.6 mi · 30 yrs of record (1991–2020) · 2173 ft elev.
Data from TIMBER LAKE, SD US, 22.6 miles away with 30-year NOAA record (1991-2020).
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