Frost history / Butternut 3SW, WI
Butternut 3SW, WI: frost dates by year
Last spring and first fall frost at NOAA station USC00471249, 1998 to 2025, measured from daily minimum temperatures.
Elevation 1,570 ft, 45.981, -90.542. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 24 | Sep 27 |
| Earliest | Apr 30 (2012) | Sep 1 (2001) |
| Latest | Jun 20 (2003) | Oct 18 (2021) |
| Trend | 7.6 days earlier per decade | 10.6 days later per decade |
| Years with data | 24 | 22 |
At 28°F (hard freeze) the median last spring date is May 13 and the median first fall date is Sep 30.
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 25 | Oct 8 | Apr 20 | Oct 8 |
| 2024 | May 12 | Oct 4 | Apr 26 | Oct 16 |
| 2023 | May 4 | Oct 9 | Apr 27 | Oct 29 |
| 2022 | May 23 | Sep 28 | May 5 | Sep 28 |
| 2021 | May 29 | Oct 18 | May 13 | Oct 22 |
| 2020 | May 13 | Sep 10 | May 13 | Sep 18 |
| 2019 | no data | Oct 12 | no data | Oct 25 |
| 2018 | May 13 | Sep 29 | Apr 30 | Sep 29 |
| 2017 | May 20 | no data | May 9 | no data |
| 2015 | Jun 1 | Sep 30 | May 21 | Sep 30 |
| 2014 | May 18 | Sep 12 | Apr 24 | Oct 10 |
| 2013 | May 25 | no data | May 25 | no data |
| 2012 | Apr 30 | no data | Apr 30 | no data |
| 2011 | May 27 | Sep 15 | May 5 | Sep 17 |
| 2010 | May 16 | Sep 26 | May 10 | Oct 3 |
| 2009 | Jun 7 | Sep 30 | May 31 | Sep 30 |
| 2008 | May 29 | Sep 9 | May 27 | Oct 3 |
| 2007 | no data | Sep 15 | no data | Sep 15 |
| 2006 | May 23 | Sep 20 | May 22 | Oct 5 |
| 2005 | May 16 | Sep 29 | May 4 | Oct 27 |
| 2004 | May 28 | no data | May 16 | no data |
| 2003 | Jun 20 | Sep 29 | Jun 1 | Sep 29 |
| 2002 | May 22 | Sep 15 | May 22 | Sep 23 |
| 2001 | Jun 4 | Sep 1 | May 30 | Sep 14 |
| 2000 | Jun 5 | Sep 5 | May 20 | Sep 15 |
| 1998 | Jun 8 | Sep 3 | Jun 5 | Sep 22 |
"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.