Fox River Grove, IL 60021 Frost Dates
Frost dates for Fox River Grove, IL, ZIP 60021
The last spring frost here typically falls around 04/25, about 240 days from today. The first fall frost typically arrives around 10/19, about 177 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 Fox River Grove, not a forecast for this year.
What to do before the first frost
Zone 5b around Fox River Grove 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 04/25 isn't a guarantee
04/25 is the middle of 30 years of NOAA records, not a promise. Plant by 04/10 and you're betting against frost in roughly 9 years out of 10. 05/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Fox River Grove compares
Fox River Grove's growing season runs about 177 days, ranking 26,107 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 1,123 of 1,548.
Learn more
the frost range explains how to read the range around Fox River Grove's dates instead of trusting one, and local microclimates explains what one yard in Fox River Grove can differ from the 60021 normal.