Deerfield, IL 60015 Frost Dates
Deerfield, IL: when does the frost end?
Typically, the last spring freeze lands around 04/19, roughly 234 days out. Fall's first freeze usually shows up around 10/26, roughly 190 days after the last spring frost.
Deerfield 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 8 weeks until Deerfield's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/19 isn't a guarantee
04/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/03 and only about 1 year in 10 sees frost after that.
Deerfield against the rest of the dataset
About 190 days separate Deerfield's last and first frost, putting it 21,062 of 40,283 ZIP codes nationally. Within IL, it ranks 501 of 1,548.
Learn more
Before leaning on 60015's figures: the frost range explains how to read the range around Deerfield's dates instead of trusting one, while local microclimates explains what one yard in Deerfield can differ from the 60015 normal.