Grand Ridge, IL 61325 Frost Dates
Frost dates for Grand Ridge, IL, ZIP 61325
The last spring frost here typically falls around 04/27, about 242 days from today. The first fall frost typically arrives around 10/17, about 171 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 Grand Ridge, not a forecast for this year.
What to do before the first frost
Zone 5b around Grand Ridge 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.
The actual range around Grand Ridge'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. 05/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Grand Ridge compares
At roughly 171 frost-free days, Grand Ridge places 28,779 of 40,283 ZIP codes in this dataset. Within IL, it ranks 1,382 of 1,548.
Learn more
local microclimates explains what one yard in Grand Ridge can differ from the 61325 normal, and zone vs. frost date explains why Zone 5b and Grand Ridge's frost date answer different questions.