Brookings County, South Dakota · Frost dates
Brookings County frost dates.
First-frost, last-frost, and growing-season length for Brookings County, South Dakota. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 05-19
- 20%
- 05-14
- 50%
- 05-06
- 80%
- 04-29
- 90%
- 04-25
First fall frost
- 10%
- 09-17
- 20%
- 09-22
- 50%
- 10-01
- 80%
- 10-09
- 90%
- 10-13
28°F — killing freeze
Last spring freeze
- 10%
- 05-10
- 20%
- 05-05
- 50%
- 04-28
- 80%
- 04-18
- 90%
- 04-13
First fall freeze
- 10%
- 09-25
- 20%
- 09-30
- 50%
- 10-08
- 80%
- 10-19
- 90%
- 10-24
Growing season length (days, 28°F threshold)
- Short year
- 138
- Median
- 163
- Long year
- 194
Source NOAA station
BROOKINGS 2 NE, SD US
3.9 mi · 30 yrs of record (1991–2020) · 1639 ft elev.
Data from BROOKINGS 2 NE, SD US, 3.9 miles away with 30-year NOAA record (1991-2020).
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