Harvey, IL 60426 Frost Dates
Frost dates for Harvey, IL, ZIP 60426
Typically, the last spring freeze lands around 04/23, roughly 238 days out. The first fall frost typically arrives around 10/20, about 179 frost-free days later.
Harvey sits in USDA Zone 6a (-10 to -5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 6a around Harvey 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.
How much risk comes with planting early here
04/23 is the middle of 30 years of NOAA records, not a promise. Plant by 04/09 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 Harvey compares
At roughly 179 frost-free days, Harvey places 25,203 of 40,283 ZIP codes in this dataset. Within IL, it ranks 1,002 of 1,548.
Learn more
zone vs. frost date explains why Zone 6a and Harvey's frost date answer different questions, and the frost range explains how to read the range around Harvey's dates instead of trusting one.