Benson, MN: frost dates by year

Last spring and first fall frost at NOAA station USC00210667, 1953 to 2025, measured from daily minimum temperatures.

Elevation 1,030 ft, 45.317, -95.617. Download the data (JSON) · NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 6	Oct 1
Earliest	Apr 6 (1987)	Sep 3 (1974)
Latest	May 24 (2002)	Oct 27 (1963)
Trend	0.6 days earlier per decade	0.8 days later per decade
Years with data	72	71

At 28°F (hard freeze) the median last spring date is Apr 22 and the median first fall date is Oct 11.

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

"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 1991–2020 frost probabilities.