Rochelle, IL: frost dates by year

Last spring and first fall frost at NOAA station USC00117354, 1979 to 2017, measured from daily minimum temperatures.

Elevation 775 ft, 41.912, -89.071. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 29	Oct 5
Earliest	Mar 29 (1999)	Sep 6 (1986)
Latest	May 28 (1992)	Nov 9 (2016)
Trend	little change (less than half a day per decade)	5.7 days later per decade
Years with data	36	36

At 28°F (hard freeze) the median last spring date is Apr 13 and the median first fall date is Oct 17.

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
2017	Apr 8	no data	Mar 24	no data
2016	May 15	Nov 9	Apr 13	Nov 12
2015	May 2	Oct 17	Apr 24	Oct 17
2014	May 17	Oct 12	Apr 16	Nov 1
2013	May 13	Oct 20	Apr 5	Oct 22
2012	Apr 28	Sep 23	Apr 11	Oct 6
2011	May 5	Oct 3	May 4	Oct 29
2010	May 10	Oct 4	Mar 27	Oct 29
2009	Apr 15	Oct 10	Apr 13	Oct 10
2008	Apr 29	Oct 22	Apr 3	Oct 28
2007	Apr 17	Sep 16	Apr 17	Nov 1
2006	Apr 27	Oct 12	Apr 26	Oct 12
2005	May 5	Oct 23	May 4	Oct 23
2004	May 4	Oct 5	Apr 14	Oct 5
2003	Apr 24	no data	Apr 11	no data
2002	May 22	Oct 20	Apr 6	Oct 20
2001	Apr 18	Oct 6	Apr 18	Oct 7
2000	Apr 13	Oct 7	Apr 13	Oct 7
1999	Mar 29	Sep 17	Mar 28	Oct 18
1998	Apr 17	Oct 21	Apr 6	Oct 23
1997	May 17	Oct 15	Apr 19	Oct 27
1996	Apr 29	Oct 11	Apr 11	Oct 11
1995	Apr 26	Sep 23	Apr 6	Oct 17
1994	May 1	Oct 10	Apr 8	Nov 16
1993	Apr 21	Sep 30	Apr 5	Oct 10
1992	May 28	Oct 17	May 27	Oct 17
1991	Apr 22	Sep 19	Apr 2	Oct 14
1990	Apr 19	Oct 11	Apr 18	Oct 19
1989	no data	Sep 24	no data	Oct 4
1988	Apr 27	Oct 5	Apr 18	Oct 6
1987	no data	Oct 2	no data	Oct 7
1986	May 2	Sep 6	Apr 22	Oct 5
1984	Apr 6	Sep 15	Apr 6	Sep 28
1983	May 9	Sep 21	May 9	Nov 4
1982	Apr 28	Sep 23	Apr 22	Oct 22
1981	May 12	Oct 2	Apr 15	Oct 19
1980	May 9	Oct 4	Apr 15	Oct 6
1979	May 1	Oct 5	Apr 10	Oct 7

"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.