Coffeen, IL 62017 Frost Dates
62017, near Coffeen, IL: the frost window
The last spring frost here typically falls around 04/12, about 227 days from today. Fall's first freeze usually shows up around 10/20, roughly 190 days after the last spring frost.
Zone 6b (-5 to 0°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 Coffeen, not a forecast for this year.
Stretching the season past the first frost
Coffeen'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 Coffeen's last frost
04/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/27 and only about 1 year in 10 sees frost after that.
Coffeen against the rest of the dataset
Coffeen's growing season runs about 190 days, ranking 21,265 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 531 of 1,548.
Learn more
Two guides worth reading on 62017: zone vs. frost date, on why Zone 6b and Coffeen's frost date answer different questions, and the frost range, on how to read the range around Coffeen's dates instead of trusting one.