Salem 5NE, SD: frost dates by year

Last spring and first fall frost at NOAA station USC00395360, 2008 to 2025, measured from daily minimum temperatures.

Elevation 1,594 ft, 43.745, -97.308. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 11	Oct 7
Earliest	Apr 20 (2012)	Sep 15 (2011)
Latest	May 22 (2022)	Oct 19 (2010)
Trend	2.3 days earlier per decade	3.8 days later per decade
Years with data	18	18

At 28°F (hard freeze) the median last spring date is Apr 30 and the median first fall date is Oct 13.

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 30	Oct 13	Apr 22	Oct 22
2024	Apr 24	Oct 7	Apr 21	Oct 14
2023	May 3	Oct 7	May 3	Oct 7
2022	May 22	Oct 7	Apr 27	Oct 7
2021	May 11	Oct 15	May 7	Oct 16
2020	May 11	Oct 2	May 10	Oct 15
2019	May 20	Oct 11	Apr 15	Oct 11
2018	Apr 28	Oct 4	Apr 26	Oct 4
2017	May 21	Oct 10	Apr 28	Oct 10
2016	May 15	Oct 6	May 14	Oct 13
2015	May 12	Oct 14	Apr 23	Oct 16
2014	May 17	Oct 4	May 16	Oct 4
2013	May 12	Oct 13	May 3	Oct 18
2012	Apr 20	Sep 18	Apr 17	Sep 22
2011	May 3	Sep 15	May 3	Oct 17
2010	May 9	Oct 19	Apr 8	Oct 21
2009	May 16	Sep 29	May 2	Oct 9
2008	May 11	Oct 14	May 11	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 to 2020 frost probabilities.