Frost history / Lisle-Morton Arboretum, IL
Lisle-Morton Arboretum, IL: frost dates by year
Last spring and first fall frost at NOAA station USC00115097, 2007 to 2025, measured from daily minimum temperatures.
Elevation 680 ft, 41.813, -88.073. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 30 | Oct 12 |
| Earliest | Apr 17 (2025) | Sep 24 (2012) |
| Latest | May 15 (2016) | Oct 28 (2007) |
| Trend | 1.9 days earlier per decade | 3.9 days later per decade |
| Years with data | 17 | 19 |
At 28°F (hard freeze) the median last spring date is Apr 21 and the median first fall date is Oct 28.
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 | Apr 17 | Oct 24 | Apr 17 | Oct 24 |
| 2024 | Apr 25 | Oct 16 | Apr 6 | Nov 21 |
| 2023 | May 3 | Oct 11 | Apr 28 | Oct 30 |
| 2022 | Apr 27 | Oct 8 | Apr 17 | Oct 8 |
| 2021 | May 13 | Oct 23 | Apr 22 | Nov 3 |
| 2020 | no data | Oct 5 | no data | Oct 30 |
| 2019 | Apr 28 | Oct 18 | Apr 2 | Nov 1 |
| 2018 | Apr 30 | Oct 12 | Apr 30 | Oct 18 |
| 2017 | May 8 | Oct 26 | Mar 23 | Nov 8 |
| 2016 | May 15 | Oct 22 | Apr 12 | Nov 12 |
| 2015 | May 1 | Oct 17 | Apr 24 | Oct 18 |
| 2014 | Apr 23 | Oct 11 | Apr 16 | Nov 2 |
| 2013 | May 13 | Oct 22 | May 3 | Oct 22 |
| 2012 | Apr 27 | Sep 24 | Apr 27 | Oct 8 |
| 2011 | May 4 | Oct 2 | Apr 21 | Oct 30 |
| 2010 | Apr 28 | Oct 5 | Apr 28 | Oct 22 |
| 2009 | Apr 22 | Oct 9 | Apr 12 | Oct 9 |
| 2008 | May 4 | Oct 6 | Apr 30 | Oct 28 |
| 2007 | no data | Oct 28 | no data | Oct 28 |
"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.