Frost history / Big Falls Hydro, WI
Big Falls Hydro, WI: frost dates by year
Last spring and first fall frost at NOAA station USC00470773, 1983 to 2025, measured from daily minimum temperatures.
Elevation 1,205 ft, 45.556, -90.959. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 14 | Sep 28 |
| Earliest | Apr 25 (2024) | Aug 24 (1987) |
| Latest | Jun 22 (1992) | Oct 24 (2016) |
| Trend | 8.5 days earlier per decade | 7.4 days later per decade |
| Years with data | 28 | 31 |
At 28°F (hard freeze) the median last spring date is Apr 29 and the median first fall date is Oct 10.
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 3 | Oct 8 | Apr 17 | Oct 24 |
| 2024 | Apr 25 | Oct 7 | Apr 25 | Oct 16 |
| 2023 | Apr 28 | Oct 17 | Apr 27 | Oct 29 |
| 2022 | May 4 | Sep 28 | Apr 28 | Oct 18 |
| 2021 | May 12 | Oct 17 | Apr 26 | Oct 22 |
| 2020 | May 10 | Sep 18 | May 9 | Oct 5 |
| 2019 | May 11 | Oct 12 | Apr 29 | Oct 25 |
| 2018 | Apr 30 | Sep 29 | Apr 29 | Oct 13 |
| 2017 | Apr 30 | Oct 16 | Apr 8 | Oct 29 |
| 2016 | May 15 | Oct 24 | May 15 | Nov 12 |
| 2015 | May 20 | Oct 14 | Apr 24 | Oct 18 |
| 2014 | Apr 26 | Oct 4 | Apr 22 | Oct 10 |
| 2013 | May 24 | Oct 20 | Apr 26 | Oct 20 |
| 2012 | Apr 30 | Sep 18 | Apr 27 | Oct 7 |
| 2011 | May 4 | Sep 15 | Apr 29 | Oct 21 |
| 2010 | May 9 | Oct 3 | May 9 | Oct 22 |
| 2009 | May 17 | Sep 30 | Apr 12 | Oct 10 |
| 2008 | May 18 | Oct 3 | Apr 30 | Oct 4 |
| 2007 | May 18 | Sep 15 | Apr 17 | Sep 15 |
| 2006 | no data | Sep 20 | no data | Oct 10 |
| 1994 | Jun 2 | no data | May 28 | no data |
| 1993 | Jun 5 | Sep 6 | Jun 1 | Sep 9 |
| 1992 | Jun 22 | Sep 11 | Jun 21 | Sep 23 |
| 1991 | May 3 | Sep 20 | May 3 | Sep 20 |
| 1990 | Jun 4 | Oct 2 | May 12 | Oct 9 |
| 1989 | May 27 | Sep 12 | May 7 | Sep 23 |
| 1988 | no data | Sep 7 | no data | Oct 5 |
| 1987 | no data | Aug 24 | no data | Sep 25 |
| 1986 | Jun 2 | Sep 7 | May 3 | Sep 13 |
| 1985 | Jun 3 | Sep 11 | Jun 2 | Sep 25 |
| 1984 | May 30 | Sep 26 | May 27 | Sep 29 |
| 1983 | no data | Sep 23 | no data | Sep 23 |
"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.