Coatsburg, IL 62325 Frost Dates
62325, near Coatsburg, IL: the frost window
Typically, the last spring freeze lands around 04/14, roughly 229 days out. Fall's first freeze usually shows up around 10/23, roughly 191 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 Coatsburg, not a forecast for this year.
Stretching the season past the first frost
Coatsburg'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 04/14 isn't a guarantee
04/14 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 05/01 and only about 1 year in 10 sees frost after that.
Coatsburg against the rest of the dataset
At roughly 191 frost-free days, Coatsburg places 20,934 of 40,283 ZIP codes in this dataset. Within IL, it ranks 475 of 1,548.
Learn more
Two guides worth reading on 62325: zone vs. frost date, on why Zone 6a and Coatsburg's frost date answer different questions, and the frost range, on how to read the range around Coatsburg's dates instead of trusting one.