Chicago Ridge, IL 60415 Frost Dates
60415, near Chicago Ridge, IL: the frost window
Around 04/10 is the usual last spring frost, about 225 days away. Fall's first freeze usually shows up around 11/01, roughly 203 days after the last spring frost.
Zone 6a (-10 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 Chicago Ridge, not a forecast for this year.
Stretching the season past the first frost
Chicago Ridge's growing season runs out in roughly 9 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
04/10 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/26 and only about 1 year in 10 sees frost after that.
Chicago Ridge against the rest of the dataset
At roughly 203 frost-free days, Chicago Ridge places 16,861 of 40,283 ZIP codes in this dataset. Within IL, it ranks 154 of 1,548.
Learn more
Two guides worth reading on 60415: local microclimates, on what one yard in Chicago Ridge can differ from the 60415 normal, and zone vs. frost date, on why Zone 6a and Chicago Ridge's frost date answer different questions.