Frost history / Rock Island L&D 15, IL
Rock Island L&D 15, IL: frost dates by year
Last spring and first fall frost at NOAA station USC00117391, 1985 to 2025, measured from daily minimum temperatures.
Elevation 568 ft, 41.518, -90.565. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 12 | Oct 27 |
| Earliest | Mar 24 (1998) | Oct 2 (2003) |
| Latest | May 13 (2013) | Nov 20 (2024) |
| Trend | 2.0 days later per decade | little change (less than half a day per decade) |
| Years with data | 35 | 35 |
At 28°F (hard freeze) the median last spring date is Apr 4 and the median first fall date is Nov 3.
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 8 | no data | Apr 8 | no data |
| 2024 | Apr 6 | Nov 20 | Mar 27 | Nov 25 |
| 2023 | Apr 7 | Oct 30 | Mar 24 | Oct 30 |
| 2022 | Apr 26 | Oct 18 | Apr 19 | Oct 18 |
| 2021 | Apr 16 | Nov 3 | Apr 16 | Nov 3 |
| 2020 | May 11 | Oct 5 | Apr 17 | Nov 2 |
| 2019 | Apr 30 | Oct 12 | Apr 30 | Oct 30 |
| 2018 | Apr 20 | Oct 21 | Apr 20 | Nov 9 |
| 2017 | Apr 7 | Oct 28 | Mar 27 | Oct 29 |
| 2016 | Apr 12 | Oct 13 | Apr 9 | Nov 19 |
| 2015 | Apr 4 | Nov 10 | Mar 28 | Nov 21 |
| 2014 | Apr 15 | Oct 31 | Apr 15 | Nov 1 |
| 2013 | May 13 | Oct 23 | Apr 3 | Nov 11 |
| 2012 | Apr 11 | Oct 27 | Mar 9 | Oct 31 |
| 2011 | no data | Nov 4 | no data | Nov 17 |
| 2009 | Apr 12 | no data | Mar 27 | no data |
| 2008 | Apr 3 | Oct 28 | Apr 3 | Oct 28 |
| 2007 | Apr 12 | Nov 6 | Apr 7 | Nov 7 |
| 2006 | Apr 27 | Oct 23 | Mar 24 | Nov 1 |
| 2005 | Mar 27 | Nov 16 | Mar 15 | Nov 16 |
| 2004 | Apr 13 | no data | Mar 22 | no data |
| 2003 | Apr 10 | Oct 2 | Apr 9 | Nov 6 |
| 2002 | Apr 7 | Oct 20 | Apr 5 | Nov 1 |
| 2001 | Apr 17 | Nov 20 | Mar 27 | Dec 9 |
| 2000 | Apr 8 | Oct 7 | Apr 8 | Nov 13 |
| 1999 | Mar 26 | Oct 23 | Mar 26 | Nov 29 |
| 1998 | Mar 24 | Nov 5 | Mar 21 | Nov 5 |
| 1997 | Apr 17 | Oct 22 | Apr 9 | Oct 27 |
| 1996 | Apr 10 | Oct 30 | Apr 10 | Nov 1 |
| 1995 | Apr 5 | Nov 2 | Apr 4 | Nov 3 |
| 1994 | Apr 7 | Nov 10 | Mar 17 | Nov 22 |
| 1993 | Apr 17 | Oct 29 | Apr 17 | Oct 31 |
| 1992 | Apr 12 | Oct 17 | Apr 2 | Oct 19 |
| 1991 | Mar 30 | Oct 19 | Mar 30 | Nov 1 |
| 1990 | Apr 18 | Oct 19 | Apr 7 | Nov 7 |
| 1989 | May 6 | Oct 18 | Apr 10 | Nov 16 |
| 1988 | no data | Oct 24 | no data | Oct 24 |
| 1985 | no data | Nov 5 | no data | Nov 19 |
"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.