Oak Brook, IL 60523 Frost Dates
When can you plant in Oak Brook, IL?
Typically, the last spring freeze lands around 04/27, roughly 242 days out. The first fall frost typically arrives around 10/17, about 173 frost-free days later.
Oak Brook sits in USDA Zone 6a (-10 to -5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
About 7 weeks of growing season left in Oak Brook before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Oak Brook's last frost
04/27 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Oak Brook compares
Oak Brook's growing season runs about 173 days, ranking 27,830 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 1,316 of 1,548.
Learn more
the frost range covers how to read the range around Oak Brook's dates instead of trusting one. local microclimates covers what one yard in Oak Brook can differ from the 60523 normal.