Indianapolis, IN: frost dates by year

Last spring and first fall frost at NOAA station USW00093819, 1951 to 2024, measured from daily minimum temperatures.

Elevation 790 ft, 39.708, -86.280. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 17	Oct 21
Earliest	Mar 23 (2017)	Sep 30 (1993)
Latest	May 27 (1961)	Nov 21 (2024)
Trend	0.9 days earlier per decade	0.7 days later per decade
Years with data	74	74

At 28°F (hard freeze) the median last spring date is Apr 7 and the median first fall date is Nov 3.

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
2024	Apr 6	Nov 21	Mar 19	Nov 29
2023	Apr 24	Oct 30	Mar 28	Oct 31
2022	Apr 19	Oct 19	Mar 28	Nov 14
2021	Apr 22	Nov 3	Apr 21	Nov 15
2020	May 9	Oct 16	May 9	Nov 2
2019	Apr 1	Oct 31	Apr 1	Nov 1
2018	Apr 29	Oct 21	Apr 8	Nov 10
2017	Mar 23	Oct 29	Mar 22	Nov 10
2016	Apr 12	Nov 12	Apr 9	Nov 13
2015	Apr 24	Oct 18	Mar 29	Nov 14
2014	Apr 16	Nov 1	Apr 16	Nov 2
2013	Apr 20	Oct 22	Apr 3	Oct 25
2012	Apr 11	Oct 8	Mar 10	Nov 5
2011	Apr 1	Oct 30	Mar 31	Nov 11
2010	Apr 28	Nov 3	Mar 7	Nov 6
2009	Apr 8	Oct 18	Mar 20	Dec 3
2008	Apr 15	Oct 28	Mar 24	Nov 18
2007	Apr 13	Nov 6	Apr 9	Nov 7
2006	Apr 9	Oct 12	Mar 26	Oct 25
2005	May 3	Oct 29	Mar 21	Nov 16
2004	Apr 14	Oct 17	Apr 5	Dec 3
2003	Apr 23	Oct 2	Apr 23	Nov 9
2002	May 19	Nov 1	Apr 6	Nov 1
2001	Apr 18	Oct 7	Apr 18	Oct 28
2000	Apr 12	Oct 7	Apr 9	Nov 15
1999	Mar 28	Oct 25	Mar 25	Nov 3
1998	Mar 24	Oct 23	Mar 24	Nov 5
1997	May 16	Oct 22	Apr 18	Oct 22
1996	Apr 27	Oct 20	Apr 10	Nov 2
1995	Apr 5	Oct 22	Apr 5	Nov 3
1994	Apr 8	Oct 25	Apr 7	Nov 22
1993	Apr 22	Sep 30	Apr 3	Nov 1
1992	Apr 28	Oct 17	Apr 5	Oct 19
1991	Apr 2	Oct 7	Mar 31	Oct 16
1990	Apr 18	Oct 19	Apr 18	Nov 7
1989	Apr 14	Oct 4	Apr 13	Nov 3
1988	Apr 20	Oct 8	Mar 22	Oct 12
1987	Apr 8	Oct 4	Apr 4	Oct 8
1986	Apr 23	Nov 3	Apr 23	Nov 10
1985	Apr 10	Oct 2	Apr 9	Nov 20
1984	Apr 7	Nov 2	Mar 12	Nov 6
1983	Apr 20	Nov 4	Apr 20	Nov 4
1982	Apr 11	Oct 17	Apr 7	Oct 22
1981	Apr 6	Oct 3	Mar 25	Oct 23
1980	Apr 25	Oct 5	Mar 27	Oct 13
1979	Apr 10	Oct 10	Apr 10	Oct 13
1978	Apr 22	Oct 15	Mar 18	Nov 8
1977	Apr 29	Oct 13	Apr 9	Nov 12
1976	May 8	Oct 10	Apr 28	Oct 18
1975	Apr 21	Oct 30	Apr 13	Nov 14
1974	May 7	Oct 2	Apr 9	Oct 3
1973	Apr 14	Oct 29	Apr 13	Nov 5
1972	Apr 9	Oct 18	Apr 9	Oct 19
1971	May 4	Nov 4	Apr 7	Nov 4
1970	Apr 11	Oct 16	Apr 7	Oct 17
1969	Mar 31	Oct 17	Mar 31	Oct 23
1968	May 6	Oct 5	Apr 6	Oct 26
1967	Apr 25	Oct 11	Mar 22	Nov 4
1966	May 10	Oct 30	May 10	Nov 2
1965	Apr 3	Oct 24	Mar 31	Oct 29
1964	Apr 9	Oct 9	Apr 4	Oct 10
1963	May 1	Oct 30	Apr 10	Oct 30
1962	Apr 20	Oct 24	Apr 16	Oct 25
1961	May 27	Oct 27	Apr 16	Oct 27
1960	Apr 11	Oct 20	Apr 10	Oct 21
1959	Apr 13	Oct 18	Mar 28	Nov 2
1958	Apr 12	Oct 30	Mar 29	Nov 7
1957	Apr 15	Oct 20	Apr 14	Nov 6
1956	Apr 24	Nov 8	Apr 23	Nov 9
1955	Apr 8	Oct 24	Apr 8	Nov 3
1954	May 10	Oct 28	Apr 4	Oct 31
1953	Apr 21	Oct 30	Apr 19	Nov 5
1952	Apr 16	Oct 6	Apr 11	Oct 7
1951	Apr 23	Oct 29	Apr 17	Nov 2

"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.