Maquon, IL 61458 Frost Dates
Frost dates for Maquon, IL, ZIP 61458
The last spring frost here typically falls around 04/21, about 236 days from today. The first fall frost typically arrives around 10/20, about 181 frost-free days later.
Zone 5b (-15 to -10°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 Maquon, not a forecast for this year.
What to do before the first frost
Zone 5b around Maquon 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
04/21 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. 05/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Maquon compares
About 181 days separate Maquon's last and first frost, putting it 24,728 of 40,283 ZIP codes nationally. Within IL, it ranks 947 of 1,548.
Learn more
local microclimates explains what one yard in Maquon can differ from the 61458 normal, and zone vs. frost date explains why Zone 5b and Maquon's frost date answer different questions.