Frost history / Illinois City Dam 16, IL

Illinois City Dam 16, IL: frost dates by year

Last spring and first fall frost at NOAA station USC00114355, 2011 to 2025, measured from daily minimum temperatures.

Elevation 550 ft, 41.426, -91.009. Download the data (JSON) · NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 18	Oct 21
Earliest	Apr 3 (2017)	Oct 8 (2012)
Latest	Apr 27 (2022)	Nov 12 (2016)
Trend	little change (less than half a day per decade)	0.7 days later per decade
Years with data	14	15

At 28°F (hard freeze) the median last spring date is Apr 5 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	Oct 24	Apr 9	Oct 25
2024	Apr 7	Oct 16	Mar 28	Nov 26
2023	Apr 25	Oct 11	Apr 25	Oct 31
2022	Apr 27	Oct 18	Mar 29	Oct 19
2021	Apr 23	Nov 2	Apr 3	Nov 4
2020	Apr 19	Oct 27	Apr 17	Oct 28
2019	Apr 16	Oct 29	Apr 1	Oct 31
2018	Apr 20	Oct 16	Apr 18	Oct 21
2017	Apr 3	Oct 29	Mar 20	Oct 29
2016	Apr 13	Nov 12	Apr 11	Nov 12
2015	Apr 23	Oct 18	Apr 5	Nov 9
2014	Apr 16	Oct 20	Apr 16	Nov 1
2013	Apr 21	Oct 22	Apr 5	Oct 25
2012	Apr 13	Oct 8	Mar 6	Nov 12
2011	no data	Oct 21	no data	Oct 28

"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 1991–2020 frost probabilities.