Frost history / Delano, MN
Delano, MN: frost dates by year
Last spring and first fall frost at NOAA station USC00212088, 1978 to 2025, measured from daily minimum temperatures.
Elevation 975 ft, 45.047, -93.777. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 2 | Oct 8 |
| Earliest | Apr 15 (2007) | Sep 14 (2011) |
| Latest | May 31 (2015) | Oct 26 (2007) |
| Trend | 0.7 days earlier per decade | 1.6 days later per decade |
| Years with data | 23 | 23 |
At 28°F (hard freeze) the median last spring date is Apr 24 and the median first fall date is Oct 14.
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 9 | Oct 24 |
| 2024 | no data | Oct 14 | no data | Oct 16 |
| 2020 | no data | Oct 2 | no data | Oct 19 |
| 2019 | May 13 | Oct 12 | Apr 15 | Oct 25 |
| 2018 | Apr 30 | Oct 4 | Apr 23 | Oct 12 |
| 2017 | Apr 28 | Oct 10 | Apr 8 | Oct 31 |
| 2016 | May 16 | Oct 9 | May 16 | Nov 12 |
| 2015 | May 31 | Oct 16 | Apr 23 | Oct 17 |
| 2014 | Apr 26 | Oct 5 | Apr 25 | Oct 9 |
| 2013 | May 13 | Oct 20 | Apr 24 | Oct 20 |
| 2012 | Apr 25 | Sep 23 | Apr 17 | Oct 7 |
| 2011 | May 4 | Sep 14 | May 4 | Oct 21 |
| 2010 | May 10 | no data | May 10 | no data |
| 2009 | Apr 28 | Oct 9 | Apr 13 | Oct 9 |
| 2008 | Apr 30 | Oct 16 | Apr 30 | Oct 21 |
| 2007 | Apr 15 | Oct 26 | Apr 14 | Oct 27 |
| 1991 | Apr 23 | no data | Apr 21 | no data |
| 1990 | May 2 | Oct 9 | May 2 | Oct 10 |
| 1989 | May 6 | Sep 22 | May 5 | Oct 2 |
| 1988 | Apr 27 | no data | Apr 20 | no data |
| 1987 | Apr 23 | Oct 2 | Apr 3 | Oct 2 |
| 1986 | no data | Oct 8 | no data | Oct 12 |
| 1981 | May 11 | Sep 28 | May 10 | Oct 2 |
| 1980 | May 15 | Sep 26 | Apr 24 | Oct 5 |
| 1979 | May 21 | Oct 6 | May 12 | Oct 9 |
| 1978 | May 2 | Oct 8 | May 2 | Oct 14 |
"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.