Glen Ellyn, IL 60137 Frost Dates
Glen Ellyn, IL: when does the frost end?
Typically, the last spring freeze lands around 04/27, roughly 242 days out. Fall's first freeze usually shows up around 10/17, roughly 173 days after the last spring frost.
Glen Ellyn 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
With roughly 7 weeks until Glen Ellyn's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
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.
Glen Ellyn against the rest of the dataset
About 173 days separate Glen Ellyn's last and first frost, putting it 27,790 of 40,283 ZIP codes nationally. Within IL, it ranks 1,304 of 1,548.
Learn more
Before leaning on 60137's figures: the frost range explains how to read the range around Glen Ellyn's dates instead of trusting one, while local microclimates explains what one yard in Glen Ellyn can differ from the 60137 normal.