Danforth, IL 60930 Frost Dates
Danforth, IL: when does the frost end?
Typically, the last spring freeze lands around 04/25, roughly 240 days out. Fall's first freeze usually shows up around 10/20, roughly 175 days after the last spring frost.
Danforth 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 8 weeks until Danforth's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Danforth's last frost
04/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/10 and only about 1 year in 10 sees frost after that.
Danforth against the rest of the dataset
Danforth's growing season runs about 175 days, ranking 27,158 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 1,212 of 1,548.
Learn more
Before leaning on 60930's figures: zone vs. frost date explains why Zone 5b and Danforth's frost date answer different questions, while the frost range explains how to read the range around Danforth's dates instead of trusting one.