Pierron, IL 62273 Frost Dates
Frost dates for Pierron, IL, ZIP 62273
Around 04/06 is the usual last spring frost, about 221 days away. The first fall frost typically arrives around 10/29, about 204 frost-free days later.
Zone 6b (-5 to 0°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 Pierron, not a forecast for this year.
What to do before the first frost
Zone 6b around Pierron 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.
The actual range around Pierron's last frost
04/06 is the middle of 30 years of NOAA records, not a promise. Plant by 03/23 and you're betting against frost in roughly 9 years out of 10. 04/22 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Pierron compares
At roughly 204 frost-free days, Pierron places 16,724 of 40,283 ZIP codes in this dataset. Within IL, it ranks 137 of 1,548.
Learn more
zone vs. frost date explains why Zone 6b and Pierron's frost date answer different questions, and the frost range explains how to read the range around Pierron's dates instead of trusting one.