Sparta, IL 62286 Frost Dates
Frost dates for Sparta, IL, ZIP 62286
Typically, the last spring freeze lands around 04/12, roughly 227 days out. The first fall frost typically arrives around 10/22, about 191 frost-free days later.
Zone 7a (0 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 Sparta, not a forecast for this year.
What to do before the first frost
Zone 7a around Sparta 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.
Why 04/12 isn't a guarantee
04/12 is the middle of 30 years of NOAA records, not a promise. Plant by 03/29 and you're betting against frost in roughly 9 years out of 10. 04/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Sparta compares
At roughly 191 frost-free days, Sparta places 20,766 of 40,283 ZIP codes in this dataset. Within IL, it ranks 445 of 1,548.
Learn more
zone vs. frost date explains why Zone 7a and Sparta's frost date answer different questions, and the frost range explains how to read the range around Sparta's dates instead of trusting one.