North Henderson, IL 61466 Frost Dates
Frost dates for North Henderson, IL, ZIP 61466
Typically, the last spring freeze lands around 04/20, roughly 235 days out. The first fall frost typically arrives around 10/19, about 180 frost-free days later.
Zone 5b (-15 to -10°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 North Henderson, not a forecast for this year.
What to do before the first frost
Zone 5b around North Henderson has about 7 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 North Henderson's last frost
04/20 is the middle of 30 years of NOAA records, not a promise. Plant by 04/06 and you're betting against frost in roughly 9 years out of 10. 05/05 is the safer bet, historically only a 1-in-10 chance of frost that late.
How North Henderson compares
About 180 days separate North Henderson's last and first frost, putting it 25,094 of 40,283 ZIP codes nationally. Within IL, it ranks 982 of 1,548.
Learn more
the frost range explains how to read the range around North Henderson's dates instead of trusting one, and local microclimates explains what one yard in North Henderson can differ from the 61466 normal.