Stonington, IL 62567 Frost Dates
Frost dates for Stonington, IL, ZIP 62567
Typically, the last spring freeze lands around 04/14, roughly 229 days out. The first fall frost typically arrives around 10/24, about 192 frost-free days later.
Zone 6a (-10 to -5°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 Stonington, not a forecast for this year.
What to do before the first frost
Zone 6a around Stonington 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.
The actual range around Stonington's last frost
04/14 is the middle of 30 years of NOAA records, not a promise. Plant by 04/01 and you're betting against frost in roughly 9 years out of 10. 05/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Stonington compares
Stonington's growing season runs about 192 days, ranking 20,493 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 432 of 1,548.
Learn more
zone vs. frost date explains why Zone 6a and Stonington's frost date answer different questions, and the frost range explains how to read the range around Stonington's dates instead of trusting one.