Pennington County, South Dakota · Frost dates
Pennington County frost dates.
First-frost, last-frost, and growing-season length for Pennington County, South Dakota. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 05-26
- 20%
- 05-21
- 50%
- 05-12
- 80%
- 05-04
- 90%
- 05-01
First fall frost
- 10%
- 09-16
- 20%
- 09-21
- 50%
- 10-01
- 80%
- 10-09
- 90%
- 10-14
28°F — killing freeze
Last spring freeze
- 10%
- 05-14
- 20%
- 05-10
- 50%
- 05-02
- 80%
- 04-24
- 90%
- 04-18
First fall freeze
- 10%
- 09-26
- 20%
- 09-30
- 50%
- 10-09
- 80%
- 10-19
- 90%
- 10-23
Growing season length (days, 28°F threshold)
- Short year
- 135
- Median
- 160
- Long year
- 188
Source NOAA station
RAPID CITY RGNL AP, SD US
11.8 mi · 30 yrs of record (1991–2020) · 3160 ft elev.
Data from RAPID CITY RGNL AP, SD US, 11.8 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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