Sidell 4N, IL: frost dates by year

Last spring and first fall frost at NOAA station USC00117952, 2002 to 2025, measured from daily minimum temperatures.

Elevation 672 ft, 39.968, -87.823. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 16	Oct 15
Earliest	Apr 3 (2019)	Oct 2 (2003)
Latest	May 10 (2021)	Nov 1 (2021)
Trend	little change (less than half a day per decade)	3.1 days later per decade
Years with data	19	22

At 28°F (hard freeze) the median last spring date is Apr 2 and the median first fall date is Oct 29.

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 8	Oct 23	Mar 17	Nov 2
2024	Apr 6	Oct 16	Mar 21	Oct 16
2023	Apr 24	Oct 31	Mar 21	Nov 11
2022	Apr 26	Oct 8	Mar 29	Oct 19
2021	May 10	Nov 1	Apr 2	Nov 3
2020	May 9	Oct 5	Apr 18	Oct 5
2019	Apr 3	Oct 12	Apr 1	Nov 1
2018	Apr 29	Oct 12	Apr 29	Oct 16
2017	Apr 8	Oct 31	Mar 24	Nov 10
2016	Apr 13	Oct 22	Apr 10	Nov 13
2015	no data	Oct 16	no data	Oct 18
2012	Apr 24	Oct 6	Apr 12	Oct 8
2011	no data	Oct 21	no data	Nov 11
2010	Apr 28	Oct 4	Mar 27	Oct 29
2009	Apr 13	Oct 11	Apr 8	Nov 12
2008	Apr 16	Oct 28	Mar 25	Oct 28
2007	Apr 16	Oct 28	Apr 10	Nov 7
2006	Apr 10	Oct 12	Apr 9	Oct 13
2005	May 4	Oct 28	Mar 24	Nov 17
2004	Apr 14	Oct 5	Apr 5	Oct 17
2003	Apr 23	Oct 2	Apr 13	Oct 2
2002	no data	Oct 14	no data	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.