Frost history / Aitkin 2E, MN
Aitkin 2E, MN: frost dates by year
Last spring and first fall frost at NOAA station USC00210059, 1959 to 2022, measured from daily minimum temperatures.
Elevation 1,215 ft, 46.526, -93.668. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 18 | Sep 24 |
| Earliest | Apr 25 (2001) | Sep 1 (1974) |
| Latest | Jun 9 (1995) | Oct 21 (2021) |
| Trend | little change (less than half a day per decade) | 0.8 days later per decade |
| Years with data | 36 | 35 |
At 28°F (hard freeze) the median last spring date is May 5 and the median first fall date is Oct 2.
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 |
|---|---|---|---|---|
| 2022 | May 6 | no data | May 4 | no data |
| 2021 | May 30 | Oct 21 | May 29 | Oct 22 |
| 2020 | May 13 | Sep 9 | May 13 | Oct 4 |
| 2016 | May 18 | no data | May 18 | no data |
| 2015 | May 21 | no data | Apr 29 | no data |
| 2014 | no data | Sep 11 | no data | Oct 10 |
| 2011 | no data | Sep 15 | no data | Sep 15 |
| 2010 | May 8 | Oct 2 | Apr 27 | Oct 29 |
| 2009 | no data | Oct 6 | no data | Oct 9 |
| 2005 | no data | Oct 7 | no data | Oct 7 |
| 2004 | May 24 | Sep 28 | May 16 | Oct 4 |
| 2003 | Apr 30 | no data | Apr 8 | no data |
| 2002 | May 26 | Sep 24 | May 20 | Oct 7 |
| 2001 | Apr 25 | no data | Apr 19 | no data |
| 2000 | no data | Sep 24 | no data | Sep 24 |
| 1999 | May 10 | Sep 21 | Apr 25 | Oct 2 |
| 1998 | May 10 | Oct 1 | Apr 28 | Oct 2 |
| 1997 | May 28 | Oct 10 | May 14 | Oct 14 |
| 1996 | May 30 | Sep 13 | May 12 | Oct 3 |
| 1995 | Jun 9 | Sep 8 | Apr 27 | Sep 21 |
| 1994 | no data | Sep 27 | no data | Oct 10 |
| 1992 | May 27 | no data | May 26 | no data |
| 1991 | no data | Sep 20 | no data | Sep 27 |
| 1990 | May 29 | no data | May 10 | no data |
| 1989 | May 7 | Sep 13 | May 6 | Sep 26 |
| 1988 | Jun 9 | Oct 4 | Apr 24 | Oct 5 |
| 1986 | May 20 | Oct 6 | May 3 | Oct 9 |
| 1985 | Apr 26 | Sep 24 | Apr 11 | Sep 25 |
| 1981 | no data | Sep 17 | no data | Sep 28 |
| 1980 | no data | Sep 23 | no data | Sep 26 |
| 1979 | May 21 | Oct 7 | Apr 30 | Oct 7 |
| 1978 | May 6 | Sep 25 | May 2 | Oct 14 |
| 1977 | May 7 | no data | May 7 | no data |
| 1976 | May 18 | Sep 16 | May 7 | Sep 23 |
| 1975 | no data | Sep 13 | no data | Oct 16 |
| 1974 | May 14 | Sep 1 | May 6 | Sep 22 |
| 1973 | May 17 | Sep 20 | May 4 | Sep 20 |
| 1972 | May 9 | Sep 22 | Apr 25 | Sep 30 |
| 1970 | May 4 | no data | May 2 | no data |
| 1966 | May 11 | no data | May 10 | no data |
| 1965 | May 29 | Sep 25 | Apr 28 | Sep 25 |
| 1963 | May 23 | Oct 12 | May 23 | Oct 28 |
| 1962 | Jun 2 | no data | Apr 23 | no data |
| 1961 | May 29 | Sep 23 | May 26 | Sep 23 |
| 1960 | May 11 | Sep 27 | May 11 | Sep 29 |
| 1959 | May 22 | Sep 16 | May 15 | Sep 17 |
"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.