Yankton County, South Dakota · Frost dates
Yankton County frost dates.
First-frost, last-frost, and growing-season length for Yankton County, South Dakota. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 05-10
- 20%
- 05-06
- 50%
- 04-27
- 80%
- 04-18
- 90%
- 04-13
First fall frost
- 10%
- 09-27
- 20%
- 10-01
- 50%
- 10-11
- 80%
- 10-19
- 90%
- 10-23
28°F — killing freeze
Last spring freeze
- 10%
- 05-02
- 20%
- 04-27
- 50%
- 04-18
- 80%
- 04-07
- 90%
- 04-03
First fall freeze
- 10%
- 10-06
- 20%
- 10-12
- 50%
- 10-21
- 80%
- 10-29
- 90%
- 11-03
Growing season length (days, 28°F threshold)
- Short year
- 157
- Median
- 186
- Long year
- 214
Source NOAA station
YANKTON 2 E, SD US
9.0 mi · 30 yrs of record (1991–2020) · 1180 ft elev.
Data from YANKTON 2 E, SD US, 9 miles away with 30-year NOAA record (1991-2020).
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