Oswego, NY: frost dates by year

Last spring and first fall frost at NOAA station USC00306314, 1951 to 2025, measured from daily minimum temperatures.

Elevation 324 ft, 43.450, -76.537. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 25	Oct 21
Earliest	Mar 27 (2010)	Sep 24 (1963)
Latest	May 18 (1983)	Nov 14 (2014)
Trend	0.5 days earlier per decade	1.7 days later per decade
Years with data	74	74

At 28°F (hard freeze) the median last spring date is Apr 9 and the median first fall date is Nov 10.

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 10	Oct 27	Apr 9	Nov 20
2024	Apr 26	Nov 3	Mar 25	Dec 2
2023	Apr 27	Nov 13	Apr 9	Nov 13
2022	Apr 30	Nov 9	Mar 30	Nov 19
2021	Apr 22	Nov 6	Apr 2	Nov 24
2020	no data	Nov 2	no data	Nov 18
2019	Apr 29	no data	Apr 5	no data
2018	Apr 20	Nov 10	Apr 15	Nov 14
2017	Apr 8	Nov 8	Mar 30	Nov 8
2016	Apr 14	Nov 1	Apr 10	Nov 20
2015	Apr 25	Oct 18	Apr 1	Nov 23
2014	Apr 20	Nov 14	Apr 17	Nov 15
2013	Apr 22	Oct 29	Apr 6	Oct 29
2012	Apr 30	Oct 13	Apr 3	Nov 7
2011	Apr 22	Oct 28	Mar 28	Nov 5
2010	Mar 27	Nov 2	Mar 27	Nov 21
2009	Apr 14	Oct 16	Apr 7	Dec 9
2008	May 1	Oct 19	Apr 3	Nov 2
2007	Apr 16	Nov 3	Apr 11	Nov 11
2006	Apr 29	Oct 13	Apr 9	Nov 22
2005	May 13	Nov 12	Mar 27	Nov 18
2004	Apr 28	Nov 4	Apr 6	Nov 4
2003	Apr 25	Nov 8	Apr 17	Nov 8
2002	Apr 24	Oct 15	Apr 7	Oct 25
2001	Apr 29	Oct 9	Mar 29	Nov 17
2000	Apr 13	Oct 10	Apr 9	Nov 20
1999	Apr 25	Oct 19	Apr 11	Nov 12
1998	Apr 12	Nov 14	Mar 25	Nov 18
1997	Apr 15	Oct 18	Apr 15	Oct 26
1996	May 7	Oct 5	Apr 9	Nov 13
1995	Apr 25	Oct 30	Apr 11	Nov 9
1994	Apr 21	Oct 11	Apr 7	Nov 12
1993	Apr 28	Oct 1	Apr 5	Oct 14
1992	Apr 29	Sep 24	Apr 15	Nov 7
1991	Apr 18	Sep 30	Apr 3	Nov 4
1990	Apr 19	Oct 27	Apr 13	Oct 27
1989	Apr 23	Oct 10	Apr 12	Nov 4
1988	May 4	Oct 20	Mar 28	Oct 31
1987	May 8	Oct 14	Apr 1	Nov 6
1986	May 3	Oct 10	Apr 22	Oct 31
1985	May 9	Oct 21	Apr 18	Oct 29
1984	May 3	Oct 6	Apr 22	Oct 6
1983	May 18	Oct 20	Apr 22	Oct 30
1982	Apr 22	Oct 24	Apr 15	Nov 10
1981	May 18	Oct 10	Apr 22	Oct 25
1980	Apr 23	Oct 10	Apr 16	Oct 24
1979	Apr 30	Oct 16	Apr 20	Nov 13
1978	May 4	Sep 26	May 4	Oct 17
1977	May 15	Oct 14	Apr 10	Nov 14
1976	Apr 12	Oct 12	Apr 12	Oct 27
1975	Apr 23	Oct 31	Apr 22	Oct 31
1974	May 5	Oct 18	May 2	Oct 28
1973	Apr 30	Nov 6	Apr 15	Nov 10
1972	Apr 28	Oct 10	Apr 26	Oct 18
1971	Apr 24	Nov 5	Apr 10	Nov 9
1970	May 7	Oct 19	Apr 13	Nov 8
1969	May 6	Oct 22	Apr 20	Oct 29
1968	Apr 19	Nov 12	Apr 6	Nov 14
1967	Apr 12	Oct 30	Apr 12	Nov 15
1966	May 10	Oct 30	May 3	Nov 20
1965	Apr 28	Oct 29	Apr 6	Nov 2
1964	Apr 11	Oct 8	Apr 5	Nov 21
1963	May 1	Sep 24	Apr 6	Nov 25
1962	Apr 20	Oct 25	Mar 24	Oct 25
1961	Apr 17	Nov 2	Apr 9	Nov 20
1960	Apr 20	Nov 7	Apr 7	Nov 30
1959	Apr 14	Oct 21	Apr 13	Nov 8
1958	May 10	Oct 6	Apr 9	Nov 2
1957	May 17	Oct 27	Apr 9	Nov 11
1956	May 17	Oct 12	Apr 21	Nov 10
1955	Apr 9	Oct 23	Mar 29	Nov 17
1954	Apr 9	Oct 8	Apr 5	Nov 10
1953	Apr 18	Oct 13	Mar 21	Nov 6
1952	Apr 12	Oct 20	Apr 11	Nov 28
1951	Apr 6	Nov 1	Mar 27	Nov 3

"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.