DeKalb, IL 60115 Frost Dates
DeKalb, IL: when does the frost end?
Typically, the last spring freeze lands around 04/24, roughly 239 days out. Fall's first freeze usually shows up around 10/18, roughly 177 days after the last spring frost.
DeKalb sits in USDA Zone 5b (-15 to -10°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 7 weeks until DeKalb's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around DeKalb's last frost
04/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/10 and only about 1 year in 10 sees frost after that.
DeKalb against the rest of the dataset
At roughly 177 frost-free days, DeKalb places 26,013 of 40,283 ZIP codes in this dataset. Within IL, it ranks 1,117 of 1,548.
Learn more
Before leaning on 60115's figures: local microclimates explains what one yard in DeKalb can differ from the 60115 normal, while zone vs. frost date explains why Zone 5b and DeKalb's frost date answer different questions.