Wilmot, SD: frost dates by year

Last spring and first fall frost at NOAA station USC00399337, 2006 to 2025, measured from daily minimum temperatures.

Elevation 1,201 ft, 45.408, -96.862. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 6	Oct 7
Earliest	Apr 20 (2007)	Sep 15 (2007)
Latest	May 16 (2014)	Oct 21 (2021)
Trend	1.5 days earlier per decade	3.9 days later per decade
Years with data	20	20

At 28°F (hard freeze) the median last spring date is Apr 26 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 29	Oct 8	Apr 20	Oct 22
2024	Apr 24	Oct 14	Apr 20	Oct 15
2023	Apr 26	Oct 7	Apr 25	Oct 11
2022	Apr 28	Sep 28	Apr 27	Oct 7
2021	May 11	Oct 21	Apr 25	Oct 23
2020	May 12	Oct 4	May 12	Oct 18
2019	May 10	Oct 11	May 7	Oct 14
2018	Apr 28	Sep 29	Apr 25	Oct 4
2017	May 2	Oct 10	May 1	Oct 10
2016	May 14	Oct 7	May 14	Oct 9
2015	May 9	Oct 3	Apr 23	Oct 16
2014	May 16	Oct 10	May 16	Oct 10
2013	May 12	Oct 16	May 12	Oct 22
2012	Apr 27	Sep 18	Apr 13	Oct 5
2011	May 4	Sep 15	May 4	Oct 2
2010	May 9	Oct 15	Apr 9	Oct 28
2009	May 10	Oct 7	Apr 29	Oct 9
2008	May 12	Oct 15	Apr 29	Oct 21
2007	Apr 20	Sep 15	Apr 14	Oct 28
2006	Apr 26	Oct 11	Apr 26	Oct 11

"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.