Frost history / Ashland 3S, WI
Ashland 3S, WI: frost dates by year
Last spring and first fall frost at NOAA station USC00470347, 2004 to 2025, measured from daily minimum temperatures.
Elevation 826 ft, 46.552, -90.916. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 20 | Oct 2 |
| Earliest | Apr 27 (2007) | Sep 15 (2011) |
| Latest | Jun 1 (2015) | Oct 22 (2021) |
| Trend | 3.7 days later per decade | 5.9 days later per decade |
| Years with data | 16 | 19 |
At 28°F (hard freeze) the median last spring date is May 8 and the median first fall date is Oct 13.
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 24 | Oct 8 | May 9 | Oct 24 |
| 2024 | May 10 | Oct 9 | Apr 24 | Oct 16 |
| 2023 | May 25 | Oct 12 | Apr 26 | Oct 29 |
| 2022 | May 5 | Sep 28 | May 5 | Sep 28 |
| 2021 | May 29 | Oct 22 | May 11 | Oct 22 |
| 2020 | May 13 | Sep 18 | May 13 | Sep 18 |
| 2019 | May 20 | Oct 13 | May 7 | Oct 25 |
| 2018 | May 20 | Sep 29 | May 12 | Oct 13 |
| 2017 | May 20 | Oct 10 | May 8 | Oct 11 |
| 2016 | no data | Oct 9 | no data | Oct 25 |
| 2015 | Jun 1 | Sep 30 | May 20 | Sep 30 |
| 2014 | no data | Oct 9 | no data | Oct 19 |
| 2013 | May 13 | Sep 22 | May 13 | Oct 25 |
| 2012 | Apr 30 | Sep 27 | Apr 29 | Oct 7 |
| 2011 | May 27 | Sep 15 | May 27 | Sep 16 |
| 2010 | May 16 | Sep 26 | May 11 | Oct 29 |
| 2008 | no data | Oct 3 | no data | Oct 4 |
| 2007 | Apr 27 | no data | Apr 18 | no data |
| 2006 | May 22 | Oct 1 | May 6 | Oct 10 |
| 2004 | no data | Oct 2 | no data | Oct 5 |
"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.