Mount Erie, IL 62446 Frost Dates
Frost dates for Mount Erie, IL, ZIP 62446
Typically, the last spring freeze lands around 04/04, roughly 219 days out. The first fall frost typically arrives around 10/28, about 206 frost-free days later.
The USDA Plant Hardiness Zone Map puts Mount Erie 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 Mount Erie has about 9 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
04/04 is the middle of 30 years of NOAA records, not a promise. Plant by 03/20 and you're betting against frost in roughly 9 years out of 10. 04/20 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mount Erie compares
At roughly 206 frost-free days, Mount Erie places 16,148 of 40,283 ZIP codes in this dataset. Within IL, it ranks 105 of 1,548.
Learn more
zone vs. frost date explains why Zone 6b and Mount Erie's frost date answer different questions, and the frost range explains how to read the range around Mount Erie's dates instead of trusting one.