Harwood Heights, IL 60656 Frost Dates
Harwood Heights, IL: when does the frost end?
Typically, the last spring freeze lands around 04/16, roughly 231 days out. Fall's first freeze usually shows up around 10/28, roughly 193 days after the last spring frost.
Zone 6a (-10 to -5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Harwood Heights, not a forecast for this year.
Stretching the season past the first frost
With roughly 9 weeks until Harwood Heights's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Harwood Heights's last frost
04/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/01 and only about 1 year in 10 sees frost after that.
Harwood Heights against the rest of the dataset
At roughly 193 frost-free days, Harwood Heights places 19,787 of 40,283 ZIP codes in this dataset. Within IL, it ranks 393 of 1,548.
Learn more
Before leaning on 60656's figures: the frost range explains how to read the range around Harwood Heights's dates instead of trusting one, while local microclimates explains what one yard in Harwood Heights can differ from the 60656 normal.