Ottawa, KS: frost dates by year

Last spring and first fall frost at NOAA station USC00146128, 1951 to 2025, measured from daily minimum temperatures.

Elevation 905 ft, 38.613, -95.281. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 14	Oct 19
Earliest	Mar 11 (2012)	Sep 22 (1995)
Latest	May 7 (1989)	Nov 11 (1998)
Trend	0.6 days earlier per decade	0.6 days later per decade
Years with data	69	72

At 28°F (hard freeze) the median last spring date is Apr 5 and the median first fall date is Nov 1.

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 9	Nov 2	Apr 9	Nov 2
2024	no data	Oct 16	no data	Oct 17
2023	Apr 24	Oct 28	Apr 7	Oct 30
2022	Apr 26	Oct 18	Apr 20	Oct 18
2021	Apr 23	Nov 3	Apr 23	Nov 13
2020	Apr 19	Oct 16	Apr 14	Oct 26
2019	Apr 13	Oct 12	Apr 1	Oct 31
2018	Apr 17	Oct 15	Apr 17	Oct 16
2017	Apr 8	Oct 28	Mar 16	Oct 28
2016	Apr 13	Nov 10	Apr 13	Nov 19
2015	Apr 5	Oct 27	Apr 5	Oct 30
2014	Apr 19	Nov 1	Apr 16	Nov 1
2013	May 4	Oct 19	Apr 25	Oct 25
2012	Mar 11	Oct 7	Mar 10	Oct 27
2011	May 2	Oct 20	Apr 5	Oct 20
2010	Mar 30	Oct 29	Mar 23	Nov 6
2009	Apr 15	Oct 11	Apr 8	Nov 27
2005	no data	Oct 25	no data	Nov 16
2004	Apr 11	Nov 5	Mar 12	Nov 25
2003	Apr 10	Oct 26	Apr 10	Nov 7
2002	Apr 5	Oct 14	Apr 4	Nov 1
2001	Apr 18	Oct 26	Mar 27	Oct 27
2000	no data	Oct 7	no data	Oct 7
1999	Mar 27	Oct 18	Mar 27	Oct 18
1998	Apr 17	Nov 11	Mar 21	Dec 8
1997	Apr 17	Oct 27	Apr 14	Oct 27
1996	Apr 8	Oct 22	Apr 6	Nov 2
1995	Apr 13	Sep 22	Mar 30	Nov 3
1994	Apr 7	Oct 25	Apr 7	Oct 26
1993	Apr 9	Oct 10	Apr 5	Oct 30
1992	Apr 22	Oct 17	Apr 2	Nov 26
1991	Mar 30	Oct 19	Mar 30	Oct 30
1990	Apr 14	Oct 22	Apr 12	Oct 22
1989	May 7	Sep 24	Apr 11	Oct 20
1988	Apr 19	Oct 26	Mar 19	Oct 28
1987	Apr 5	Oct 3	Apr 5	Oct 21
1986	Apr 22	Nov 9	Apr 22	Nov 11
1985	Apr 9	Oct 1	Apr 9	Nov 7
1984	Apr 18	Sep 30	Apr 1	Sep 30
1983	Apr 15	Sep 23	Apr 15	Nov 11
1982	Apr 21	Oct 19	Apr 21	Oct 21
1981	Mar 23	Oct 19	Mar 23	Oct 23
1980	Mar 21	Oct 12	Mar 6	Nov 16
1979	Apr 6	Oct 10	Apr 6	Nov 2
1978	Apr 21	Oct 24	Mar 27	Nov 7
1977	Mar 31	Oct 12	Mar 31	Nov 11
1976	May 3	Oct 8	Mar 16	Oct 17
1975	Apr 12	Oct 25	Apr 3	Nov 13
1974	Apr 6	Nov 6	Mar 25	Nov 14
1973	Apr 13	Nov 6	Apr 11	Nov 6
1972	Apr 8	Oct 19	Apr 4	Oct 19
1971	Apr 14	Oct 31	Apr 7	Nov 7
1970	Apr 6	Oct 16	Apr 5	Nov 1
1969	Mar 31	Oct 14	Mar 31	Oct 17
1968	Apr 5	Oct 4	Apr 5	Nov 4
1967	Apr 27	Oct 19	Apr 24	Oct 28
1966	Apr 21	Oct 16	Apr 21	Oct 16
1965	Apr 28	Oct 12	Mar 30	Nov 9
1964	Apr 9	Oct 6	Apr 9	Oct 9
1963	May 1	Oct 29	May 1	Nov 2
1962	Apr 16	Oct 25	Apr 9	Nov 5
1961	May 2	Oct 20	Apr 6	Nov 3
1960	May 1	Oct 20	Mar 26	Oct 20
1959	Apr 14	Oct 18	Mar 22	Nov 5
1958	Mar 31	Oct 1	Mar 28	Nov 10
1957	Apr 13	Oct 26	Apr 13	Oct 26
1956	Apr 24	Oct 26	Apr 24	Nov 9
1955	Apr 8	Oct 24	Mar 28	Nov 3
1954	May 4	Oct 30	Apr 3	Oct 30
1953	Apr 20	Nov 6	Apr 20	Nov 8
1952	Apr 15	Oct 6	Apr 10	Oct 6
1951	Apr 23	Oct 24	Apr 23	Nov 2

"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.