Frost history / Rend Lake Dam, IL
Rend Lake Dam, IL: frost dates by year
Last spring and first fall frost at NOAA station USC00117187, 1974 to 2025, measured from daily minimum temperatures.
Elevation 455 ft, 38.041, -88.988. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 10 | Oct 29 |
| Earliest | Mar 24 (1981) | Oct 8 (1974) |
| Latest | May 3 (1976) | Nov 13 (1986) |
| Trend | 1.1 days later per decade | 1.6 days later per decade |
| Years with data | 10 | 17 |
At 28°F (hard freeze) the median last spring date is Mar 19 and the median first fall date is Nov 9.
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 | no data | Nov 9 | no data | Nov 9 |
| 2024 | Mar 29 | no data | Mar 20 | no data |
| 2023 | no data | Oct 31 | no data | Oct 31 |
| 2021 | Apr 21 | Nov 4 | Mar 2 | Nov 7 |
| 2020 | Apr 17 | Oct 14 | Mar 8 | Nov 1 |
| 2018 | Apr 20 | Oct 24 | Apr 17 | Nov 10 |
| 2017 | no data | Oct 29 | no data | Nov 12 |
| 2014 | no data | Nov 1 | no data | Nov 2 |
| 1986 | no data | Nov 13 | no data | Nov 13 |
| 1984 | no data | Nov 2 | no data | Nov 13 |
| 1983 | no data | Nov 5 | no data | Nov 17 |
| 1982 | no data | Oct 26 | no data | Nov 4 |
| 1981 | Mar 24 | Oct 24 | Mar 19 | Oct 24 |
| 1979 | Apr 7 | Oct 10 | Apr 6 | Oct 14 |
| 1978 | Mar 26 | Nov 8 | Mar 18 | Dec 4 |
| 1977 | Apr 6 | Oct 13 | Mar 6 | Nov 13 |
| 1976 | May 3 | Oct 18 | Mar 17 | Oct 22 |
| 1975 | Apr 12 | no data | Apr 4 | no data |
| 1974 | no data | Oct 8 | no data | Nov 14 |
"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.