Warrenville, IL 60563 Frost Dates
Frost dates for Warrenville, IL, ZIP 60563
Around 04/27 is the usual last spring frost, about 242 days away. The first fall frost typically arrives around 10/17, about 173 frost-free days later.
Zone 5b (-15 to -10°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 Warrenville, not a forecast for this year.
What to do before the first frost
Zone 5b around Warrenville 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.
Why 04/27 isn't a guarantee
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 Warrenville compares
Warrenville's growing season runs about 173 days, ranking 27,809 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 1,313 of 1,548.
Learn more
zone vs. frost date explains why Zone 5b and Warrenville's frost date answer different questions, and the frost range explains how to read the range around Warrenville's dates instead of trusting one.