Owaneco, IL 62555 Frost Dates
Frost dates for Owaneco, IL, ZIP 62555
Typically, the last spring freeze lands around 04/12, roughly 227 days out. The first fall frost typically arrives around 10/20, about 190 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 Owaneco, not a forecast for this year.
What to do before the first frost
Zone 6a around Owaneco 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 Owaneco's last frost
04/12 is the middle of 30 years of NOAA records, not a promise. Plant by 03/29 and you're betting against frost in roughly 9 years out of 10. 04/27 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Owaneco compares
About 190 days separate Owaneco's last and first frost, putting it 21,315 of 40,283 ZIP codes nationally. Within IL, it ranks 545 of 1,548.
Learn more
local microclimates explains what one yard in Owaneco can differ from the 62555 normal, and zone vs. frost date explains why Zone 6a and Owaneco's frost date answer different questions.