Calumet City, IL 60409 Frost Dates
60409, near Calumet City, IL: the frost window
Typically, the last spring freeze lands around 04/23, roughly 238 days out. Fall's first freeze usually shows up around 10/20, roughly 179 days after the last spring frost.
Calumet City 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
Calumet City's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Calumet City's last frost
04/23 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 05/11 and only about 1 year in 10 sees frost after that.
Calumet City against the rest of the dataset
At roughly 179 frost-free days, Calumet City places 25,158 of 40,283 ZIP codes in this dataset. Within IL, it ranks 987 of 1,548.
Learn more
Two guides worth reading on 60409: local microclimates, on what one yard in Calumet City can differ from the 60409 normal, and zone vs. frost date, on why Zone 6a and Calumet City's frost date answer different questions.