Vinton, IA: frost dates by year

Last spring and first fall frost at NOAA station USC00138568, 1951 to 2025, measured from daily minimum temperatures.

Elevation 850 ft, 42.170, -92.008. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 29	Oct 5
Earliest	Apr 9 (1985)	Sep 13 (1953)
Latest	May 23 (1963)	Oct 30 (1973)
Trend	little change (less than half a day per decade)	0.8 days later per decade
Years with data	72	72

At 28°F (hard freeze) the median last spring date is Apr 14 and the median first fall date is Oct 16.

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

"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.