Port Huron, MI: frost dates by year

Last spring and first fall frost at NOAA station USC00206680, 1951 to 2025, measured from daily minimum temperatures.

Elevation 590 ft, 42.975, -82.419. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 25	Oct 24
Earliest	Apr 8 (2023)	Sep 24 (1989)
Latest	May 23 (1963)	Nov 22 (1994)
Trend	1.1 days earlier per decade	2.6 days later per decade
Years with data	72	73

At 28°F (hard freeze) the median last spring date is Apr 11 and the median first fall date is Nov 6.

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

"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.