Defiance, OH: frost dates by year

Last spring and first fall frost at NOAA station USC00332098, 1951 to 2025, measured from daily minimum temperatures.

Elevation 700 ft, 41.278, -84.385. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 26	Oct 17
Earliest	Mar 29 (1999)	Sep 18 (1959)
Latest	May 27 (1961)	Nov 20 (1985)
Trend	1.8 days earlier per decade	2.5 days later per decade
Years with data	74	73

At 28°F (hard freeze) the median last spring date is Apr 12 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 18	Oct 25	Apr 9	Nov 10
2024	Apr 25	Oct 17	Mar 30	Nov 29
2023	Apr 27	Oct 31	Mar 31	Oct 31
2022	Apr 27	Oct 8	Apr 22	Nov 18
2021	May 1	Oct 24	Apr 23	Nov 3
2020	May 12	Oct 3	May 9	Nov 2
2019	Apr 15	Nov 1	Apr 2	Nov 1
2018	Apr 29	Oct 16	Apr 18	Oct 18
2017	May 8	Oct 26	Mar 24	Nov 9
2016	Apr 15	Oct 25	Apr 11	Oct 25
2015	Apr 24	Oct 18	Apr 4	Nov 8
2014	Apr 17	Oct 19	Apr 17	Nov 2
2013	Apr 26	Oct 22	Apr 21	Nov 6
2012	Apr 27	Oct 31	Mar 11	Nov 5
2011	Apr 4	Oct 23	Apr 4	Oct 30
2010	Apr 11	Nov 1	Mar 28	Nov 2
2009	Apr 13	Oct 17	Mar 22	Oct 18
2008	May 1	Oct 22	Apr 3	Oct 30
2007	Apr 16	Oct 29	Apr 11	Nov 23
2006	Apr 27	Oct 12	Apr 27	Nov 2
2005	no data	Oct 29	no data	Oct 30
2004	Apr 28	Nov 8	Apr 6	Nov 9
2003	Apr 24	Oct 3	Apr 7	Nov 7
2002	May 20	Oct 14	Apr 7	Oct 31
2001	Apr 20	Oct 8	Apr 18	Nov 12
2000	Apr 13	Oct 30	Apr 10	Nov 18
1999	Mar 29	Oct 25	Mar 28	Nov 4
1998	Apr 6	Nov 4	Mar 25	Nov 4
1997	Apr 20	Oct 22	Apr 19	Oct 28
1996	May 13	Oct 11	Apr 11	Nov 1
1995	Apr 11	Sep 23	Apr 6	Nov 4
1994	Apr 9	Oct 27	Apr 9	Nov 23
1993	Apr 23	Oct 10	Apr 5	Nov 7
1992	Apr 14	Oct 19	Apr 6	Oct 19
1991	Apr 12	Oct 16	Apr 3	Oct 20
1990	Apr 19	Oct 26	Apr 19	Oct 29
1989	May 8	Oct 4	Apr 14	Nov 3
1988	Apr 26	Oct 7	Apr 20	Oct 13
1987	Apr 5	no data	Apr 4	no data
1986	Apr 24	no data	Apr 23	no data
1985	Apr 11	Nov 20	Apr 11	Nov 21
1984	Apr 12	Nov 2	Apr 2	Nov 3
1983	Apr 22	Oct 27	Apr 21	Nov 4
1982	Apr 30	Oct 17	Apr 15	Oct 17
1981	May 8	Oct 3	Apr 22	Oct 3
1980	Apr 26	Oct 5	Apr 17	Oct 6
1979	May 2	Oct 13	Apr 11	Nov 3
1978	May 3	Oct 10	May 3	Oct 24
1977	May 10	Oct 13	Apr 10	Oct 17
1976	May 9	Oct 17	Apr 14	Oct 18
1975	Apr 22	Oct 3	Apr 16	Oct 30
1974	May 8	Sep 23	May 8	Oct 2
1973	May 19	Oct 19	Apr 15	Nov 6
1972	Apr 27	Oct 13	Apr 26	Oct 19
1971	May 5	Nov 4	Apr 25	Nov 7
1970	May 7	Sep 29	Apr 11	Oct 16
1969	May 12	Oct 15	Apr 1	Oct 23
1968	May 7	Oct 5	May 6	Oct 30
1967	May 4	Oct 20	Apr 25	Oct 22
1966	May 12	Oct 2	May 10	Oct 6
1965	Apr 29	Oct 4	Apr 14	Oct 5
1964	Apr 10	Oct 5	Apr 9	Oct 7
1963	May 23	Oct 30	May 23	Oct 30
1962	Apr 24	Sep 21	Apr 20	Oct 24
1961	May 27	Sep 29	Apr 17	Oct 27
1960	May 8	Oct 20	Apr 19	Oct 21
1959	May 16	Sep 18	Apr 13	Oct 28
1958	Apr 30	Oct 2	Apr 9	Nov 7
1957	Apr 16	Sep 29	Apr 15	Oct 28
1956	Apr 25	Oct 10	Apr 24	Nov 9
1955	May 9	Oct 25	Apr 8	Nov 4
1954	May 10	Oct 19	May 8	Nov 1
1953	Apr 22	Oct 7	Apr 21	Nov 4
1952	Apr 12	Oct 3	Apr 12	Oct 7
1951	Apr 23	Sep 29	Apr 5	Oct 29

"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.