Calumet City, IL 46324 Frost Dates
46324, near Calumet City, IL: the frost window
The last spring frost here typically falls around 04/23, about 238 days from today. Fall's first freeze usually shows up around 10/20, roughly 179 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Calumet City in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's 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.
Why 04/23 isn't a guarantee
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
Calumet City's growing season runs about 179 days, ranking 25,157 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 986 of 1,548.
Learn more
Two guides worth reading on 46324: zone vs. frost date, on why Zone 6a and Calumet City's frost date answer different questions, and the frost range, on how to read the range around Calumet City's dates instead of trusting one.