Winnetka, IL 60093 Frost Dates
Frost dates for Winnetka, IL, ZIP 60093
Typically, the last spring freeze lands around 04/26, roughly 241 days out. The first fall frost typically arrives around 10/21, about 176 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 Winnetka, not a forecast for this year.
What to do before the first frost
Zone 6a around Winnetka 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 Winnetka's last frost
04/26 is the middle of 30 years of NOAA records, not a promise. Plant by 04/11 and you're betting against frost in roughly 9 years out of 10. 05/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Winnetka compares
At roughly 176 frost-free days, Winnetka places 26,402 of 40,283 ZIP codes in this dataset. Within IL, it ranks 1,163 of 1,548.
Learn more
local microclimates explains what one yard in Winnetka can differ from the 60093 normal, and zone vs. frost date explains why Zone 6a and Winnetka's frost date answer different questions.