Newton, IA: frost dates by year

Last spring and first fall frost at NOAA station USC00135992, 1951 to 2023, measured from daily minimum temperatures.

Elevation 960 ft, 41.712, -93.030. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 21	Oct 12
Earliest	Apr 4 (1987)	Sep 22 (1974)
Latest	May 22 (1963)	Nov 4 (1998)
Trend	1.0 days earlier per decade	1.0 days later per decade
Years with data	68	69

At 28°F (hard freeze) the median last spring date is Apr 10 and the median first fall date is Oct 25.

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