Boonville 1S, IN: frost dates by year

Last spring and first fall frost at NOAA station USC00120852, 1991 to 2025, measured from daily minimum temperatures.

Elevation 400 ft, 38.030, -87.274. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 11	Oct 23
Earliest	Mar 19 (2010)	Oct 7 (1991)
Latest	May 9 (2020)	Nov 24 (2024)
Trend	little change (less than half a day per decade)	4.2 days later per decade
Years with data	35	34

At 28°F (hard freeze) the median last spring date is Mar 31 and the median first fall date is Nov 2.

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 12	Nov 3	Mar 21	Nov 10
2024	Apr 6	Nov 24	Apr 6	Nov 26
2023	Apr 24	Oct 31	Mar 21	Oct 31
2022	Apr 10	Oct 9	Mar 28	Oct 20
2021	Apr 22	Nov 3	Apr 2	Nov 4
2020	May 9	Oct 16	Apr 16	Nov 2
2019	Apr 2	Nov 1	Apr 1	Nov 1
2018	Apr 17	Oct 21	Apr 17	Oct 21
2017	Mar 23	Oct 30	Mar 19	Nov 11
2016	Apr 12	Nov 10	Mar 6	Nov 13
2015	Apr 5	Oct 17	Mar 29	Nov 14
2014	Apr 16	Nov 2	Mar 26	Nov 2
2013	Apr 25	Oct 25	Apr 3	Oct 25
2012	Apr 12	Oct 11	Mar 10	Nov 1
2011	Apr 1	Oct 29	Mar 2	Nov 11
2010	Mar 19	Oct 29	Mar 7	Oct 30
2009	Apr 9	Oct 18	Mar 12	Dec 2
2008	Apr 15	Oct 28	Mar 24	Nov 10
2007	Apr 13	no data	Apr 9	no data
2006	Apr 9	Oct 14	Mar 27	Oct 24
2005	Mar 21	Oct 26	Mar 20	Nov 11
2004	Apr 5	Nov 9	Mar 23	Dec 2
2003	Mar 31	Nov 8	Mar 31	Nov 8
2002	Apr 7	Nov 2	Apr 5	Nov 2
2001	Apr 18	Oct 17	Apr 18	Oct 28
2000	Apr 12	Oct 8	Apr 9	Oct 9
1999	Mar 28	Oct 18	Mar 27	Oct 24
1998	Apr 11	Oct 22	Mar 24	Nov 7
1997	Apr 18	Oct 22	Apr 18	Oct 22
1996	Apr 10	Oct 19	Apr 10	Nov 2
1995	Apr 5	Oct 15	Apr 5	Nov 4
1994	May 2	Oct 25	Apr 7	Oct 27
1993	Apr 22	Oct 22	Apr 22	Oct 28
1992	Apr 28	Oct 17	Apr 5	Oct 19
1991	Mar 31	Oct 7	Mar 31	Oct 16

"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.