Pierre 24 S, SD: frost dates by year

Last spring and first fall frost at NOAA station USW00094085, 2007 to 2024, measured from daily minimum temperatures.

Elevation 2,124 ft, 44.019, -100.353. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 3	Oct 9
Earliest	Apr 13 (2007)	Sep 22 (2012)
Latest	May 22 (2022)	Oct 26 (2008)
Trend	little change (less than half a day per decade)	1.7 days earlier per decade
Years with data	18	18

At 28°F (hard freeze) the median last spring date is Apr 25 and the median first fall date is Oct 15.

The trend is a straight-line fit through the years with a freeze. A positive spring trend means the last frost now comes later. Short or patchy records give noisy trends.

Chart

Last spring frost (32°F)

First fall frost (32°F)

Dots are single years. The gray line is the median, the green line the fitted trend.

Year by year

Year	Last spring 32°F	First fall 32°F	Last spring 28°F	First fall 28°F
2024	Apr 21	Oct 14	Apr 20	Oct 15
2023	May 2	Oct 7	Apr 23	Oct 26
2022	May 22	Oct 7	Apr 26	Oct 7
2021	Apr 25	Oct 14	Apr 24	Oct 21
2020	May 11	Oct 15	May 10	Oct 15
2019	May 2	Oct 10	May 2	Oct 10
2018	Apr 28	Oct 3	Apr 17	Oct 4
2017	Apr 30	Oct 4	Apr 28	Oct 10
2016	May 14	Oct 7	Apr 11	Oct 7
2015	May 19	Oct 16	Apr 22	Oct 29
2014	May 15	Oct 3	Apr 17	Oct 4
2013	May 12	Oct 6	May 4	Oct 24
2012	Apr 22	Sep 22	Apr 11	Oct 5
2011	May 3	Oct 18	May 3	Oct 19
2010	May 12	Oct 18	May 8	Oct 27
2009	May 16	Oct 4	Apr 28	Oct 9
2008	May 3	Oct 26	May 3	Oct 26
2007	Apr 13	Oct 11	Apr 12	Oct 28

"none" means the station recorded no freeze at that threshold in that half of the year. "no data" means more than 10% of the season's daily readings were missing. Years with no usable data are left out. See the methodology for the rules, and the ZIP lookup for 1991 to 2020 frost probabilities.