Cissna Park, IL 60926 Frost Dates
Frost dates for Cissna Park, IL, ZIP 60926
Typically, the last spring freeze lands around 04/22, roughly 237 days out. The first fall frost typically arrives around 10/19, about 180 frost-free days later.
The USDA Plant Hardiness Zone Map puts Cissna Park 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 Cissna Park 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.
Why 04/22 isn't a guarantee
04/22 is the middle of 30 years of NOAA records, not a promise. Plant by 04/07 and you're betting against frost in roughly 9 years out of 10. 05/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Cissna Park compares
Cissna Park's growing season runs about 180 days, ranking 24,989 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 968 of 1,548.
Learn more
zone vs. frost date explains why Zone 6a and Cissna Park's frost date answer different questions, and the frost range explains how to read the range around Cissna Park's dates instead of trusting one.