Eldora, IA: frost dates by year

Last spring and first fall frost at NOAA station USC00132573, 1957 to 2022, measured from daily minimum temperatures.

Elevation 1,073 ft, 42.365, -93.097. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 28	Oct 6
Earliest	Apr 5 (1987)	Sep 20 (1962)
Latest	May 23 (1963)	Oct 31 (1971)
Trend	little change (less than half a day per decade)	0.8 days later per decade
Years with data	62	65

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

"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.