McLeansboro, IL 62859 Frost Dates
Frost dates for McLeansboro, IL, ZIP 62859
The last spring frost here typically falls around 04/11, about 226 days from today. The first fall frost typically arrives around 10/21, about 190 frost-free days later.
The USDA Plant Hardiness Zone Map puts McLeansboro in Zone 6b (-5 to 0°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 6b around McLeansboro has about 8 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 04/11 isn't a guarantee
04/11 is the middle of 30 years of NOAA records, not a promise. Plant by 03/27 and you're betting against frost in roughly 9 years out of 10. 04/26 is the safer bet, historically only a 1-in-10 chance of frost that late.
How McLeansboro compares
At roughly 190 frost-free days, McLeansboro places 21,181 of 40,283 ZIP codes in this dataset. Within IL, it ranks 511 of 1,548.
Learn more
the frost range explains how to read the range around McLeansboro's dates instead of trusting one, and local microclimates explains what one yard in McLeansboro can differ from the 62859 normal.