Sycamore, IL 60178 Frost Dates
Frost dates for Sycamore, IL, ZIP 60178
The last spring frost here typically falls around 04/24, about 239 days from today. The first fall frost typically arrives around 10/18, about 177 frost-free days later.
The USDA Plant Hardiness Zone Map puts Sycamore in Zone 5b (-15 to -10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 5b around Sycamore has about 7 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.
How much risk comes with planting early here
04/24 is the middle of 30 years of NOAA records, not a promise. Plant by 04/09 and you're betting against frost in roughly 9 years out of 10. 05/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Sycamore compares
At roughly 177 frost-free days, Sycamore places 26,049 of 40,283 ZIP codes in this dataset. Within IL, it ranks 1,119 of 1,548.
Learn more
the frost range explains how to read the range around Sycamore's dates instead of trusting one, and local microclimates explains what one yard in Sycamore can differ from the 60178 normal.