Benton 2 N, IL: frost dates by year

Last spring and first fall frost at NOAA station USC00110608, 1977 to 2008, measured from daily minimum temperatures.

Elevation 445 ft, 38.034, -88.920. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 6	Oct 22
Earliest	Mar 20 (2005)	Oct 7 (1991)
Latest	Apr 28 (1992)	Oct 29 (2007)
Trend	2.8 days earlier per decade	3.8 days later per decade
Years with data	20	18

At 28°F (hard freeze) the median last spring date is Apr 4 and the median first fall date is Nov 4.

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
2008	Mar 25	Oct 28	Mar 24	Oct 29
2007	Apr 13	Oct 29	Apr 9	Nov 7
2006	Mar 27	Oct 13	Mar 26	Oct 24
2005	Mar 20	Oct 26	Mar 20	Nov 17
2004	Apr 5	Oct 17	Mar 13	Nov 25
2003	no data	Oct 27	no data	Nov 8
2002	Apr 5	no data	Apr 5	no data
2001	Apr 18	Oct 17	Apr 18	Oct 28
2000	Apr 9	Oct 10	Mar 12	Nov 12
1999	Mar 27	Oct 24	Mar 27	Oct 25
1998	Apr 5	Oct 23	Mar 24	Nov 7
1997	Apr 18	Oct 22	Apr 14	Oct 22
1996	Apr 10	no data	Apr 10	no data
1995	Apr 5	Oct 25	Apr 5	Nov 4
1994	Apr 7	Oct 26	Apr 7	Nov 23
1993	Apr 22	Oct 22	Apr 5	Oct 31
1992	Apr 28	Oct 19	Apr 3	Nov 15
1991	Mar 31	Oct 7	Mar 15	Oct 16
1990	Apr 18	no data	Apr 12	no data
1989	Apr 12	Oct 20	Apr 11	Nov 3
1988	no data	Oct 12	no data	Oct 13
1977	Mar 25	no data	Mar 7	no data

"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.