Bethany, MO: frost dates by year

Last spring and first fall frost at NOAA station USC00230608, 1951 to 2023, measured from daily minimum temperatures.

Elevation 949 ft, 40.258, -94.027. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 23	Oct 11
Earliest	Mar 30 (2010)	Sep 19 (1991)
Latest	May 23 (1963)	Nov 13 (2016)
Trend	1.9 days earlier per decade	2.6 days later per decade
Years with data	61	62

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