Bentley, IL: frost dates by year

Last spring and first fall frost at NOAA station USC00110598, 1995 to 2025, measured from daily minimum temperatures.

Elevation 650 ft, 40.344, -91.112. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 17	Oct 18
Earliest	Mar 23 (2017)	Sep 22 (1995)
Latest	May 5 (2011)	Nov 12 (2016)
Trend	0.9 days earlier per decade	7.3 days later per decade
Years with data	29	30

At 28°F (hard freeze) the median last spring date is Apr 6 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 9	Nov 2	Apr 9	Nov 2
2024	Apr 6	Oct 17	Mar 19	Nov 21
2023	Apr 24	Oct 30	Mar 21	Oct 30
2022	Apr 27	Oct 18	Apr 20	Oct 18
2021	Apr 23	Nov 2	Apr 2	Nov 3
2020	Apr 19	Oct 27	Apr 16	Nov 2
2019	Apr 28	Oct 12	Mar 31	Oct 31
2018	Apr 17	Oct 16	Apr 17	Oct 21
2017	Mar 23	Oct 29	Mar 23	Oct 29
2016	Apr 13	Nov 12	Apr 9	Nov 20
2015	Apr 5	Oct 18	Apr 5	Nov 22
2014	Apr 16	Nov 1	Apr 16	Nov 1
2013	Apr 20	Oct 24	Apr 4	Oct 25
2012	Apr 12	Oct 6	Apr 12	Nov 12
2011	May 5	Oct 21	Apr 6	Oct 28
2010	Mar 27	Oct 29	Mar 27	Oct 29
2009	Apr 13	Oct 10	Mar 15	Nov 27
2008	Apr 30	no data	Apr 29	no data
2007	Apr 15	Oct 28	Apr 9	Nov 2
2006	no data	Oct 12	no data	Oct 12
2005	May 4	Oct 26	Mar 20	Nov 10
2004	Apr 14	Oct 2	Apr 14	Nov 12
2003	Apr 10	Oct 2	Apr 9	Oct 2
2002	Apr 6	Oct 7	Apr 6	Oct 20
2001	Apr 18	Oct 6	Apr 1	Oct 26
2000	Apr 12	Oct 7	Apr 12	Oct 7
1999	Apr 17	Oct 18	Mar 27	Oct 24
1998	Apr 17	Oct 22	Mar 24	Nov 5
1997	Apr 17	Oct 14	Apr 17	Oct 22
1996	Apr 30	Oct 11	Apr 9	Oct 31
1995	no data	Sep 22	no data	Nov 3

"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.