Westchester, IL 60154 Frost Dates
Frost dates for Westchester, IL, ZIP 60154
Typically, the last spring freeze lands around 04/11, roughly 226 days out. The first fall frost typically arrives around 10/31, about 201 frost-free days later.
The USDA Plant Hardiness Zone Map puts Westchester 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 Westchester has about 9 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 04/11 isn't a guarantee
04/11 is the middle of 30 years of NOAA records, not a promise. Plant by 03/30 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 Westchester compares
About 201 days separate Westchester's last and first frost, putting it 17,459 of 40,283 ZIP codes nationally. Within IL, it ranks 243 of 1,548.
Learn more
the frost range explains how to read the range around Westchester's dates instead of trusting one, and local microclimates explains what one yard in Westchester can differ from the 60154 normal.