Frost history / Pattison Ranger Staion, WI
Pattison Ranger Staion, WI: frost dates by year
Last spring and first fall frost at NOAA station USC00476413, 2001 to 2025, measured from daily minimum temperatures.
Elevation 1,100 ft, 46.537, -92.119. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 21 | Oct 5 |
| Earliest | Apr 29 (2012) | Sep 23 (2012) |
| Latest | Jun 3 (2009) | Oct 21 (2021) |
| Trend | 5.1 days earlier per decade | 4.2 days later per decade |
| Years with data | 18 | 18 |
At 28°F (hard freeze) the median last spring date is May 2 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 |
|---|---|---|---|---|
| 2025 | May 23 | Oct 8 | May 1 | Oct 8 |
| 2024 | May 10 | Oct 8 | Apr 25 | Oct 16 |
| 2023 | May 3 | Oct 9 | Apr 27 | Oct 28 |
| 2022 | May 7 | Sep 28 | May 5 | Oct 18 |
| 2021 | May 29 | Oct 21 | May 11 | Oct 22 |
| 2019 | no data | Oct 12 | no data | Oct 24 |
| 2016 | May 17 | Oct 10 | May 15 | Nov 19 |
| 2015 | Jun 1 | Oct 2 | May 1 | Oct 17 |
| 2014 | May 15 | Oct 9 | Apr 23 | Oct 11 |
| 2013 | May 26 | Oct 20 | May 24 | Oct 20 |
| 2012 | Apr 29 | Sep 23 | Apr 27 | Oct 12 |
| 2011 | May 27 | Oct 2 | May 3 | Oct 21 |
| 2010 | May 10 | Sep 25 | May 9 | Oct 4 |
| 2009 | Jun 3 | Sep 30 | Apr 28 | Oct 10 |
| 2008 | May 27 | Oct 3 | May 12 | Oct 4 |
| 2007 | May 20 | no data | May 4 | no data |
| 2006 | May 22 | no data | Apr 25 | no data |
| 2005 | May 16 | Oct 7 | May 12 | Oct 27 |
| 2004 | no data | Oct 4 | no data | Nov 8 |
| 2003 | no data | Sep 29 | no data | Oct 1 |
| 2001 | May 31 | no data | Apr 18 | no data |
"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.