Frost history / Willmar 5N, MN
Willmar 5N, MN: frost dates by year
Last spring and first fall frost at NOAA station USC00219001, 2010 to 2022, measured from daily minimum temperatures.
Elevation 1,190 ft, 45.190, -95.059. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 4 | Oct 8 |
| Earliest | Apr 24 (2012) | Sep 15 (2011) |
| Latest | May 17 (2014) | Oct 22 (2021) |
| Trend | 4.5 days earlier per decade | 11.3 days later per decade |
| Years with data | 11 | 13 |
At 28°F (hard freeze) the median last spring date is Apr 22 and the median first fall date is Oct 17.
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 | Apr 29 | Oct 8 | Apr 28 | Oct 15 |
| 2021 | Apr 25 | Oct 22 | Apr 22 | Oct 24 |
| 2020 | May 12 | Oct 5 | Apr 22 | Oct 15 |
| 2019 | May 9 | Oct 11 | Apr 16 | Oct 14 |
| 2018 | Apr 29 | Sep 29 | Apr 21 | Oct 5 |
| 2017 | May 2 | Oct 10 | Apr 28 | Oct 28 |
| 2016 | May 16 | Oct 8 | Apr 13 | Nov 19 |
| 2015 | no data | Oct 16 | no data | Oct 17 |
| 2014 | May 17 | Oct 5 | Apr 19 | Oct 10 |
| 2013 | May 13 | Oct 14 | May 4 | Oct 22 |
| 2012 | Apr 24 | Sep 23 | Apr 12 | Sep 23 |
| 2011 | May 4 | Sep 15 | May 4 | Oct 21 |
| 2010 | no data | Oct 8 | no data | Oct 29 |
"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.