Middletown, IL 62666 Frost Dates
Frost dates for Middletown, IL, ZIP 62666
Typically, the last spring freeze lands around 04/17, roughly 232 days out. The first fall frost typically arrives around 10/18, about 182 frost-free days later.
The USDA Plant Hardiness Zone Map puts Middletown in Zone 6a (-10 to -5°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 6a around Middletown 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 Middletown's last frost
04/17 is the middle of 30 years of NOAA records, not a promise. Plant by 04/04 and you're betting against frost in roughly 9 years out of 10. 05/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Middletown compares
About 182 days separate Middletown's last and first frost, putting it 24,305 of 40,283 ZIP codes nationally. Within IL, it ranks 910 of 1,548.
Learn more
local microclimates explains what one yard in Middletown can differ from the 62666 normal, and zone vs. frost date explains why Zone 6a and Middletown's frost date answer different questions.