Posen, IL 60469 Frost Dates
60469, near Posen, IL: the frost window
Typically, the last spring freeze lands around 04/10, roughly 225 days out. Fall's first freeze usually shows up around 11/01, roughly 203 days after the last spring frost.
Posen 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
Posen'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.
Why 04/10 isn't a guarantee
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.
Posen against the rest of the dataset
About 203 days separate Posen's last and first frost, putting it 16,896 of 40,283 ZIP codes nationally. Within IL, it ranks 163 of 1,548.
Learn more
Two guides worth reading on 60469: the frost range, on how to read the range around Posen's dates instead of trusting one, and local microclimates, on what one yard in Posen can differ from the 60469 normal.