Jackson, WI: frost dates by year

Last spring and first fall frost at NOAA station USC00473930, 2009 to 2025, measured from daily minimum temperatures.

Elevation 903 ft, 43.319, -88.168. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 26	Oct 17
Earliest	Apr 14 (2016)	Sep 19 (2012)
Latest	May 14 (2020)	Oct 30 (2023)
Trend	2.2 days earlier per decade	5.7 days later per decade
Years with data	16	16

At 28°F (hard freeze) the median last spring date is Apr 16 and the median first fall date is Oct 31.

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 17	Oct 24	Apr 12	Nov 2
2024	Apr 26	Oct 16	Apr 26	Oct 25
2023	Apr 18	Oct 30	Apr 8	Oct 31
2022	Apr 28	Oct 15	Apr 28	Nov 13
2021	Apr 23	Oct 24	Apr 23	Nov 3
2020	May 14	Oct 5	Apr 17	Oct 31
2019	Apr 28	Oct 18	Apr 16	Oct 30
2018	Apr 30	Oct 13	Apr 30	Oct 18
2017	May 9	Oct 26	Mar 24	Nov 7
2016	Apr 14	Oct 14	Apr 13	Nov 12
2015	Apr 25	Oct 17	Apr 25	Oct 18
2014	Apr 23	Oct 22	Apr 16	Nov 2
2013	May 14	Oct 22	Apr 21	Nov 8
2012	Apr 28	Sep 19	Apr 27	Oct 12
2011	Apr 22	Oct 28	Apr 1	Oct 30
2009	Apr 23	Oct 10	Apr 13	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.