Hull, IL 62343 Frost Dates
Frost dates for Hull, IL, ZIP 62343
Typically, the last spring freeze lands around 04/04, roughly 219 days out. The first fall frost typically arrives around 11/04, about 212 frost-free days later.
The USDA Plant Hardiness Zone Map puts Hull 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 Hull has about 10 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.
Why 04/04 isn't a guarantee
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. 04/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hull compares
About 212 days separate Hull's last and first frost, putting it 14,667 of 40,283 ZIP codes nationally. Within IL, it ranks 29 of 1,548.
Learn more
local microclimates explains what one yard in Hull can differ from the 62343 normal, and zone vs. frost date explains why Zone 6b and Hull's frost date answer different questions.