Gregory County, South Dakota · Frost dates
Gregory County frost dates.
First-frost, last-frost, and growing-season length for Gregory County, South Dakota. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 05-20
- 20%
- 05-15
- 50%
- 05-06
- 80%
- 04-28
- 90%
- 04-23
First fall frost
- 10%
- 09-21
- 20%
- 09-25
- 50%
- 10-03
- 80%
- 10-13
- 90%
- 10-17
28°F — killing freeze
Last spring freeze
- 10%
- 05-09
- 20%
- 05-04
- 50%
- 04-26
- 80%
- 04-17
- 90%
- 04-12
First fall freeze
- 10%
- 09-29
- 20%
- 10-03
- 50%
- 10-13
- 80%
- 10-21
- 90%
- 10-25
Growing season length (days, 28°F threshold)
- Short year
- 143
- Median
- 170
- Long year
- 196
Source NOAA station
GREGORY, SD US
12.2 mi · 30 yrs of record (1991–2020) · 2160 ft elev.
Data from GREGORY, SD US, 12.2 miles away with 30-year NOAA record (1991-2020).
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