Fairmount, IL 61841 Frost Dates
Frost dates for Fairmount, IL, ZIP 61841
The last spring frost here typically falls around 04/19, about 234 days from today. The first fall frost typically arrives around 10/19, about 181 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 Fairmount, not a forecast for this year.
What to do before the first frost
Zone 6a around Fairmount 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.
How much risk comes with planting early here
04/19 is the middle of 30 years of NOAA records, not a promise. Plant by 04/04 and you're betting against frost in roughly 9 years out of 10. 05/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Fairmount compares
Fairmount's growing season runs about 181 days, ranking 24,677 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 932 of 1,548.
Learn more
the frost range explains how to read the range around Fairmount's dates instead of trusting one, and local microclimates explains what one yard in Fairmount can differ from the 61841 normal.