Bloomfield, IA: frost dates by year

Last spring and first fall frost at NOAA station USC00130753, 1954 to 2019, measured from daily minimum temperatures.

Elevation 858 ft, 40.739, -92.414. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 17	Oct 14
Earliest	Mar 25 (1998)	Sep 20 (1962)
Latest	May 22 (1963)	Nov 7 (1956)
Trend	2.3 days earlier per decade	1.8 days later per decade
Years with data	63	59

At 28°F (hard freeze) the median last spring date is Apr 6 and the median first fall date is Oct 28.

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

"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.