Sanborn County, South Dakota · Frost dates
Sanborn County frost dates.
First-frost, last-frost, and growing-season length for Sanborn County, South Dakota. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 05-24
- 20%
- 05-18
- 50%
- 05-09
- 80%
- 05-01
- 90%
- 04-27
First fall frost
- 10%
- 09-14
- 20%
- 09-19
- 50%
- 09-28
- 80%
- 10-05
- 90%
- 10-10
28°F — killing freeze
Last spring freeze
- 10%
- 05-13
- 20%
- 05-08
- 50%
- 04-30
- 80%
- 04-20
- 90%
- 04-15
First fall freeze
- 10%
- 09-23
- 20%
- 09-27
- 50%
- 10-06
- 80%
- 10-15
- 90%
- 10-19
Growing season length (days, 28°F threshold)
- Short year
- 133
- Median
- 159
- Long year
- 187
Source NOAA station
FORESTBURG 4 NNE, SD US
3.4 mi · 30 yrs of record (1991–2020) · 1277 ft elev.
Data from FORESTBURG 4 NNE, SD US, 3.4 miles away with 30-year NOAA record (1991-2020).
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