Crest Hill, IL 60403 Frost Dates
Crest Hill, IL: when does the frost end?
Typically, the last spring freeze lands around 04/19, roughly 234 days out. Fall's first freeze usually shows up around 10/25, roughly 188 days after the last spring frost.
Crest Hill sits in USDA Zone 6a (-10 to -5°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 8 weeks until Crest Hill's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/19 isn't a guarantee
04/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/07 and only about 1 year in 10 sees frost after that.
Crest Hill against the rest of the dataset
At roughly 188 frost-free days, Crest Hill places 21,872 of 40,283 ZIP codes in this dataset. Within IL, it ranks 664 of 1,548.
Learn more
Before leaning on 60403's figures: the frost range explains how to read the range around Crest Hill's dates instead of trusting one, while local microclimates explains what one yard in Crest Hill can differ from the 60403 normal.