Wheaton, IL 60105 Frost Dates
Wheaton, IL: when does the frost end?
Around 04/27 is the usual last spring frost, about 242 days away. Fall's first freeze usually shows up around 10/17, roughly 173 days after the last spring frost.
Wheaton 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
With roughly 7 weeks until Wheaton's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
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.
Wheaton against the rest of the dataset
Wheaton's growing season runs about 173 days, ranking 27,750 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 1,282 of 1,548.
Learn more
Before leaning on 60105's figures: the frost range explains how to read the range around Wheaton's dates instead of trusting one, while local microclimates explains what one yard in Wheaton can differ from the 60105 normal.