Frankfort, IL 60423 Frost Dates
Frankfort, IL: when does the frost end?
Around 04/23 is the usual last spring frost, about 238 days away. Fall's first freeze usually shows up around 10/20, roughly 179 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Frankfort in Zone 6a (-10 to -5°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 Frankfort'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
04/23 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/11 and only about 1 year in 10 sees frost after that.
Frankfort against the rest of the dataset
At roughly 179 frost-free days, Frankfort places 25,197 of 40,283 ZIP codes in this dataset. Within IL, it ranks 997 of 1,548.
Learn more
Before leaning on 60423's figures: the frost range explains how to read the range around Frankfort's dates instead of trusting one, while local microclimates explains what one yard in Frankfort can differ from the 60423 normal.