Oak Park, IL 60647 Frost Dates
Frost dates for Oak Park, IL, ZIP 60647
The last spring frost here typically falls around 04/10, about 225 days from today. The first fall frost typically arrives around 11/05, about 208 frost-free days later.
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 Oak Park, not a forecast for this year.
What to do before the first frost
Zone 6a around Oak Park has about 10 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 04/10 isn't a guarantee
04/10 is the middle of 30 years of NOAA records, not a promise. Plant by 03/29 and you're betting against frost in roughly 9 years out of 10. 04/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Oak Park compares
At roughly 208 frost-free days, Oak Park places 15,520 of 40,283 ZIP codes in this dataset. Within IL, it ranks 74 of 1,548.
Learn more
zone vs. frost date explains why Zone 6a and Oak Park's frost date answer different questions, and the frost range explains how to read the range around Oak Park's dates instead of trusting one.