Cave-In-Rock, IL 62919 Frost Dates
Cave-In-Rock, IL: when does the frost end?
Around 04/19 is the usual last spring frost, about 234 days away. Fall's first freeze usually shows up around 10/20, roughly 181 days after the last spring frost.
Zone 7a (0 to 5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Cave-In-Rock, not a forecast for this year.
Stretching the season past the first frost
With roughly 8 weeks until Cave-In-Rock's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
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 05/08 and only about 1 year in 10 sees frost after that.
Cave-In-Rock against the rest of the dataset
At roughly 181 frost-free days, Cave-In-Rock places 24,725 of 40,283 ZIP codes in this dataset. Within IL, it ranks 945 of 1,548.
Learn more
Before leaning on 62919's figures: the frost range explains how to read the range around Cave-In-Rock's dates instead of trusting one, while local microclimates explains what one yard in Cave-In-Rock can differ from the 62919 normal.