Fairmont, MN: frost dates by year

Last spring and first fall frost at NOAA station USC00212698, 1951 to 2013, measured from daily minimum temperatures.

Elevation 1,187 ft, 43.645, -94.466. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 27	Oct 9
Earliest	Apr 1 (1998)	Sep 20 (1991)
Latest	May 22 (1963)	Oct 29 (1963)
Trend	2.2 days earlier per decade	little change (less than half a day per decade)
Years with data	61	60

At 28°F (hard freeze) the median last spring date is Apr 12 and the median first fall date is Oct 21.

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

"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.