New Lenox, IL 60451 Frost Dates
Frost dates for New Lenox, IL, ZIP 60451
The last spring frost here typically falls around 04/19, about 234 days from today. The first fall frost typically arrives around 10/25, about 188 frost-free days later.
New Lenox 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 New Lenox 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 New Lenox's last frost
04/19 is the middle of 30 years of NOAA records, not a promise. Plant by 04/03 and you're betting against frost in roughly 9 years out of 10. 05/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How New Lenox compares
New Lenox's growing season runs about 188 days, ranking 21,855 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 662 of 1,548.
Learn more
zone vs. frost date explains why Zone 6a and New Lenox's frost date answer different questions, and the frost range explains how to read the range around New Lenox's dates instead of trusting one.