Frost history / Cotton, MN
Cotton, MN: frost dates by year
Last spring and first fall frost at NOAA station USC00211840, 1963 to 2002, measured from daily minimum temperatures.
Elevation 1,323 ft, 47.169, -92.463. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 9 | Sep 5 |
| Earliest | May 3 (1991) | Aug 11 (1968) |
| Latest | Jul 14 (1987) | Sep 23 (1990) |
| Trend | 6.8 days earlier per decade | 7.3 days later per decade |
| Years with data | 32 | 30 |
At 28°F (hard freeze) the median last spring date is May 27 and the median first fall date is Sep 18.
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 |
|---|---|---|---|---|
| 2002 | Jun 5 | no data | May 20 | no data |
| 2001 | May 12 | no data | May 12 | no data |
| 2000 | Jun 17 | Sep 15 | Jun 5 | Sep 24 |
| 1999 | May 26 | no data | May 9 | no data |
| 1998 | Jun 4 | no data | May 10 | no data |
| 1997 | May 27 | Sep 3 | May 27 | Sep 21 |
| 1996 | May 30 | Sep 13 | May 30 | Sep 13 |
| 1995 | no data | Sep 8 | no data | Sep 20 |
| 1994 | Jun 8 | no data | Jun 3 | no data |
| 1993 | no data | Sep 5 | no data | Sep 29 |
| 1992 | Jun 21 | Sep 11 | Jun 21 | Sep 19 |
| 1991 | May 3 | Sep 6 | May 3 | Sep 20 |
| 1990 | no data | Sep 23 | no data | Oct 2 |
| 1989 | May 27 | Sep 13 | May 27 | Sep 13 |
| 1988 | Jun 29 | Sep 6 | Jun 9 | Oct 5 |
| 1987 | Jul 14 | Aug 24 | Apr 30 | Sep 25 |
| 1986 | Jun 17 | Aug 27 | Jun 2 | Aug 27 |
| 1985 | Jun 12 | Sep 11 | Jun 3 | Sep 21 |
| 1984 | no data | Sep 5 | no data | Sep 15 |
| 1983 | Jun 28 | Sep 13 | May 26 | Sep 23 |
| 1982 | Jun 30 | Aug 11 | Jun 3 | Sep 21 |
| 1981 | May 31 | Sep 4 | May 31 | Sep 17 |
| 1980 | no data | Sep 17 | no data | Sep 26 |
| 1979 | Jun 5 | no data | May 19 | no data |
| 1978 | Jun 9 | Aug 31 | May 21 | Sep 25 |
| 1977 | Jun 9 | Aug 18 | May 9 | Aug 24 |
| 1976 | May 25 | Aug 15 | May 25 | Aug 29 |
| 1975 | Jun 8 | Aug 18 | May 13 | Sep 12 |
| 1974 | May 26 | Aug 28 | May 13 | Sep 1 |
| 1973 | May 30 | Sep 12 | May 17 | Sep 17 |
| 1972 | Jul 4 | Sep 5 | Jun 10 | Sep 22 |
| 1970 | Jul 5 | Aug 21 | May 17 | Aug 31 |
| 1969 | Jul 6 | Aug 20 | Jun 20 | Sep 9 |
| 1968 | no data | Aug 11 | no data | Aug 27 |
| 1967 | Jun 25 | no data | Jun 1 | no data |
| 1966 | Jun 16 | no data | May 31 | no data |
| 1965 | Jun 30 | Aug 28 | May 29 | Aug 28 |
| 1964 | no data | Aug 13 | no data | Aug 13 |
| 1963 | Jul 3 | no data | Jun 12 | no data |
"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.