Oak Park, IL 60639 Frost Dates
Oak Park, IL: when does the frost end?
The last spring frost here typically falls around 04/10, about 225 days from today. 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
With roughly 10 weeks until Oak Park's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/10 isn't a guarantee
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
Oak Park's growing season runs about 208 days, ranking 15,519 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 73 of 1,548.
Learn more
Before leaning on 60639's figures: local microclimates explains what one yard in Oak Park can differ from the 60639 normal, while zone vs. frost date explains why Zone 6a and Oak Park's frost date answer different questions.