Wheaton, IL 60138 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.
The actual range around Wheaton's last frost
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
About 173 days separate Wheaton's last and first frost, putting it 27,755 of 40,283 ZIP codes nationally. Within IL, it ranks 1,287 of 1,548.
Learn more
Before leaning on 60138's figures: local microclimates explains what one yard in Wheaton can differ from the 60138 normal, while zone vs. frost date explains why Zone 6a and Wheaton's frost date answer different questions.