Frost history / Waskish 4NE, MN
Waskish 4NE, MN: frost dates by year
Last spring and first fall frost at NOAA station USC00218700, 1964 to 2025, measured from daily minimum temperatures.
Elevation 1,191 ft, 48.206, -94.427. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 22 | Sep 14 |
| Earliest | May 6 (2023) | Aug 20 (2004) |
| Latest | Jun 16 (1999) | Oct 12 (2019) |
| Trend | 1.1 days earlier per decade | 1.5 days later per decade |
| Years with data | 29 | 23 |
At 28°F (hard freeze) the median last spring date is May 12 and the median first fall date is Sep 28.
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 | May 22 | Sep 6 | Apr 30 | Oct 8 |
| 2024 | Jun 10 | Oct 4 | May 5 | Oct 8 |
| 2023 | May 6 | Oct 9 | May 2 | Oct 9 |
| 2022 | May 21 | no data | Apr 28 | no data |
| 2020 | May 30 | Sep 8 | May 13 | Sep 9 |
| 2019 | no data | Oct 12 | no data | Oct 24 |
| 2018 | May 15 | Sep 6 | May 11 | Sep 29 |
| 2017 | May 19 | Sep 6 | May 19 | Oct 6 |
| 2016 | May 17 | Sep 14 | May 14 | Oct 13 |
| 2015 | May 20 | Sep 29 | May 19 | Sep 29 |
| 2014 | May 17 | Sep 12 | May 4 | Oct 8 |
| 2013 | no data | Sep 16 | no data | Oct 14 |
| 2011 | May 26 | no data | May 3 | no data |
| 2009 | Jun 6 | no data | Jun 6 | no data |
| 2008 | May 28 | no data | May 27 | no data |
| 2007 | May 17 | Sep 12 | Apr 25 | Sep 12 |
| 2006 | May 22 | no data | May 22 | no data |
| 2004 | no data | Aug 20 | no data | Sep 28 |
| 2003 | May 31 | no data | May 2 | no data |
| 2001 | May 23 | Sep 24 | Apr 24 | Sep 24 |
| 2000 | May 18 | no data | Apr 29 | no data |
| 1999 | Jun 16 | no data | May 11 | no data |
| 1998 | Jun 4 | Sep 21 | May 9 | Sep 22 |
| 1997 | May 27 | Sep 3 | May 26 | Sep 23 |
| 1996 | May 13 | Sep 13 | May 12 | Sep 14 |
| 1995 | Jun 8 | Sep 7 | Jun 8 | Sep 20 |
| 1994 | May 16 | Sep 26 | May 10 | Oct 9 |
| 1993 | Jun 4 | Sep 15 | May 26 | Sep 15 |
| 1992 | May 24 | Sep 19 | May 24 | Sep 28 |
| 1991 | no data | Sep 19 | no data | Sep 20 |
| 1973 | May 17 | no data | May 17 | no data |
| 1971 | May 22 | no data | May 12 | no data |
| 1964 | Jun 4 | Sep 13 | Jun 1 | Sep 15 |
"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.