Lombard, IL 60148 Frost Dates
60148, near Lombard, IL: the frost window
The last spring frost here typically falls around 04/27, about 242 days from today. Fall's first freeze usually shows up around 10/17, roughly 173 days after the last spring frost.
Lombard 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
Lombard's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/27 isn't a guarantee
04/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/14 and only about 1 year in 10 sees frost after that.
Lombard against the rest of the dataset
Lombard's growing season runs about 173 days, ranking 27,781 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 1,301 of 1,548.
Learn more
Two guides worth reading on 60148: zone vs. frost date, on why Zone 6a and Lombard's frost date answer different questions, and the frost range, on how to read the range around Lombard's dates instead of trusting one.