Bonfield, IL 60913 Frost Dates
60913, near Bonfield, IL: the frost window
The last spring frost here typically falls around 04/19, about 234 days from today. Fall's first freeze usually shows up around 10/24, roughly 188 days after the last spring frost.
Bonfield sits in USDA Zone 5b (-15 to -10°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
Bonfield'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 Bonfield's last frost
04/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/03 and only about 1 year in 10 sees frost after that.
Bonfield against the rest of the dataset
About 188 days separate Bonfield's last and first frost, putting it 22,182 of 40,283 ZIP codes nationally. Within IL, it ranks 702 of 1,548.
Learn more
Two guides worth reading on 60913: zone vs. frost date, on why Zone 5b and Bonfield's frost date answer different questions, and the frost range, on how to read the range around Bonfield's dates instead of trusting one.