Oak Park, IL 60651 Frost Dates
60651, near Oak Park, IL: the frost window
Typically, the last spring freeze lands around 04/10, roughly 225 days out. Fall's first freeze usually shows up around 11/05, roughly 208 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Oak Park 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
Oak Park's growing season runs out in roughly 10 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Oak Park's last frost
04/10 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 04/25 and only about 1 year in 10 sees frost after that.
Oak Park against the rest of the dataset
At roughly 208 frost-free days, Oak Park places 15,521 of 40,283 ZIP codes in this dataset. Within IL, it ranks 75 of 1,548.
Learn more
Two guides worth reading on 60651: zone vs. frost date, on why Zone 6a and Oak Park's frost date answer different questions, and the frost range, on how to read the range around Oak Park's dates instead of trusting one.