Turton, SD: frost dates by year

Last spring and first fall frost at NOAA station USC00398420, 2008 to 2025, measured from daily minimum temperatures.

Elevation 1,335 ft, 45.050, -98.096. Download the data (JSON) · NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 11	Oct 4
Earliest	Apr 22 (2012)	Sep 15 (2014)
Latest	May 22 (2022)	Oct 14 (2008)
Trend	2.1 days earlier per decade	1.3 days later per decade
Years with data	16	16

At 28°F (hard freeze) the median last spring date is May 2 and the median first fall date is Oct 11.

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
2025	Apr 29	no data	Apr 29	no data
2024	Apr 24	Oct 4	Apr 24	Oct 14
2023	May 2	Oct 7	May 2	Oct 7
2022	May 22	Oct 7	Apr 26	Oct 7
2021	May 11	Sep 25	May 11	Oct 16
2020	May 12	Oct 2	May 11	Oct 15
2019	May 20	Oct 11	May 7	Oct 11
2018	May 2	Oct 4	Apr 28	Oct 4
2017	May 11	Oct 4	May 3	Oct 10
2016	May 17	Oct 7	May 15	Oct 7
2015	May 13	Oct 9	Apr 24	Oct 16
2014	May 17	Sep 15	May 16	Oct 4
2013	May 14	Oct 13	May 12	Oct 16
2012	Apr 22	Sep 18	Apr 12	Sep 22
2011	May 4	no data	May 3	no data
2010	May 9	Oct 2	Apr 6	Oct 21
2009	no data	Sep 29	no data	Oct 9
2008	no data	Oct 14	no data	Oct 16

"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 1991–2020 frost probabilities.