Toledo 3N, IA: frost dates by year

Last spring and first fall frost at NOAA station USC00138296, 1951 to 2025, measured from daily minimum temperatures.

Elevation 935 ft, 42.036, -92.581. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 29	Oct 6
Earliest	Apr 6 (1987)	Sep 15 (2007)
Latest	May 26 (1961)	Oct 31 (1993)
Trend	1.0 days earlier per decade	0.8 days later per decade
Years with data	73	75

At 28°F (hard freeze) the median last spring date is Apr 19 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
2025	Apr 17	Oct 23	Apr 9	Oct 24
2024	Apr 22	Oct 15	Apr 22	Oct 16
2023	May 4	Oct 10	Apr 25	Oct 30
2022	Apr 27	Sep 28	Apr 27	Oct 8
2021	Apr 26	Oct 22	Apr 22	Oct 23
2020	May 12	Oct 4	May 10	Oct 24
2019	Apr 29	Oct 12	Apr 29	Oct 25
2018	Apr 29	Oct 12	Apr 21	Oct 15
2017	Apr 29	Oct 28	Apr 8	Oct 29
2016	Apr 13	Oct 13	Apr 13	Oct 13
2015	Apr 24	Oct 17	Apr 12	Oct 17
2014	Apr 19	Oct 11	Apr 18	Oct 31
2013	May 13	Oct 21	Apr 25	Oct 22
2012	Apr 22	Sep 23	Apr 13	Oct 6
2011	May 5	Oct 21	May 4	Oct 22
2010	May 10	Oct 3	Mar 30	Oct 29
2009	Apr 20	Oct 10	Apr 12	Oct 10
2008	Apr 30	Oct 17	Apr 30	Oct 28
2007	Apr 16	Sep 15	Apr 14	Oct 28
2006	May 6	Oct 12	Apr 9	Oct 12
2005	May 5	Oct 8	May 5	Oct 27
2004	May 4	Oct 2	May 3	Oct 17
2003	Apr 23	Sep 29	Apr 10	Oct 2
2002	May 4	Oct 7	Apr 26	Oct 13
2001	Apr 19	Oct 6	Apr 19	Oct 17
2000	Apr 13	Oct 6	Apr 13	Oct 7
1999	Apr 19	Sep 21	Mar 27	Oct 18
1998	Apr 18	Oct 20	Mar 25	Oct 22
1997	May 16	Oct 15	Apr 17	Oct 22
1996	May 2	Oct 3	Apr 27	Oct 19
1995	Apr 25	Sep 22	Apr 25	Oct 16
1994	no data	Oct 10	no data	Oct 26
1993	Apr 23	Oct 31	Apr 17	Nov 26
1992	May 6	Sep 29	May 6	Oct 17
1991	Apr 24	Sep 20	Apr 1	Oct 7
1990	Apr 19	Oct 11	Apr 19	Oct 19
1989	May 7	Sep 23	May 7	Oct 4
1988	Apr 29	Oct 3	Apr 24	Oct 5
1987	Apr 6	Oct 3	Apr 4	Oct 3
1986	Apr 23	Oct 6	Apr 23	Nov 2
1985	Apr 15	Sep 27	Apr 10	Nov 4
1984	Apr 19	Sep 26	Apr 1	Sep 29
1983	May 8	Sep 23	Apr 20	Sep 23
1982	Apr 22	Oct 20	Apr 21	Oct 21
1981	May 12	Oct 2	Apr 15	Oct 19
1980	May 10	Sep 27	May 9	Oct 5
1979	May 12	Oct 5	May 1	Oct 13
1978	May 6	Oct 8	Mar 27	Oct 8
1977	Apr 29	Oct 6	Apr 7	Oct 13
1976	May 8	Oct 6	Apr 12	Oct 6
1975	Apr 13	Sep 26	Apr 13	Oct 2
1974	May 6	Sep 22	Apr 24	Sep 22
1973	May 15	Oct 17	Apr 28	Oct 30
1972	Apr 25	Sep 30	Apr 25	Oct 15
1971	May 13	Sep 20	Apr 14	Oct 12
1970	May 2	Oct 10	Apr 20	Oct 16
1969	May 12	Oct 14	Apr 29	Oct 14
1968	May 11	Oct 4	Apr 15	Oct 5
1967	May 10	Sep 29	Apr 24	Sep 29
1966	May 14	Sep 16	Apr 21	Oct 6
1965	Apr 27	Oct 12	Apr 19	Oct 24
1964	no data	Sep 28	no data	Oct 6
1963	May 23	Oct 28	May 23	Oct 29
1962	Apr 19	Sep 20	Apr 16	Sep 20
1961	May 26	Sep 28	May 3	Sep 28
1960	Apr 30	Oct 16	Apr 10	Oct 19
1959	Apr 22	Oct 9	Apr 21	Oct 12
1958	May 5	Oct 1	Apr 29	Oct 31
1957	May 4	Oct 10	Apr 14	Oct 25
1956	Apr 30	Oct 9	Apr 30	Nov 9
1955	Apr 7	Oct 16	Mar 29	Oct 24
1954	May 7	Oct 18	Apr 12	Oct 30
1953	May 14	Oct 27	Apr 20	Oct 27
1952	Apr 16	Oct 3	Apr 16	Oct 6
1951	Apr 23	Sep 28	Apr 19	Oct 31

"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.