Middleton, MA: frost dates by year

Last spring and first fall frost at NOAA station USC00194744, 1951 to 2025, measured from daily minimum temperatures.

Elevation 110 ft, 42.593, -71.019. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 28	Oct 12
Earliest	Mar 22 (1953)	Sep 16 (1964)
Latest	May 29 (2004)	Nov 11 (1957)
Trend	0.7 days later per decade	1.2 days later per decade
Years with data	74	73

At 28°F (hard freeze) the median last spring date is Apr 14 and the median first fall date is Oct 24.

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

"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.