Mitchell, SD: frost dates by year

Last spring and first fall frost at NOAA station USC00395669, 2004 to 2025, measured from daily minimum temperatures.

Elevation 1,287 ft, 43.764, -98.071. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 2	Oct 11
Earliest	Apr 11 (2012)	Oct 2 (2004)
Latest	May 15 (2014)	Oct 22 (2025)
Trend	2.9 days earlier per decade	2.1 days later per decade
Years with data	18	19

At 28°F (hard freeze) the median last spring date is Apr 16 and the median first fall date is Oct 24.

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 21	Oct 22	Apr 19	Nov 8
2024	Apr 21	Oct 14	Apr 4	Oct 15
2023	May 2	Oct 7	Apr 24	Oct 27
2022	May 2	Oct 7	Apr 26	Oct 7
2020	May 13	Oct 15	May 13	Oct 15
2019	no data	Oct 10	no data	Oct 24
2017	Apr 28	no data	Apr 11	no data
2016	Apr 11	Oct 7	Apr 11	Nov 18
2015	Apr 22	Oct 16	Apr 22	Nov 7
2014	May 15	Oct 4	Apr 17	Oct 30
2013	May 3	Oct 16	May 3	Oct 24
2012	Apr 11	Oct 5	Apr 11	Oct 5
2011	May 3	Oct 19	Apr 16	Oct 19
2010	May 8	Oct 18	Apr 8	Oct 28
2009	no data	Oct 8	no data	Oct 9
2008	May 11	Oct 16	Apr 28	Oct 27
2007	Apr 14	Oct 11	Apr 14	Nov 3
2006	May 12	Oct 11	Apr 8	Oct 11
2005	May 3	Oct 6	May 3	Oct 7
2004	May 1	Oct 2	Apr 13	Oct 14

"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.