Butler, IL 62015 Frost Dates
Butler, IL: when does the frost end?
Typically, the last spring freeze lands around 04/12, roughly 227 days out. Fall's first freeze usually shows up around 10/20, roughly 190 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Butler in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 8 weeks until Butler's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/12 isn't a guarantee
04/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/27 and only about 1 year in 10 sees frost after that.
Butler against the rest of the dataset
About 190 days separate Butler's last and first frost, putting it 21,330 of 40,283 ZIP codes nationally. Within IL, it ranks 552 of 1,548.
Learn more
Before leaning on 62015's figures: the frost range explains how to read the range around Butler's dates instead of trusting one, while local microclimates explains what one yard in Butler can differ from the 62015 normal.