Niantic, IL 62551 Frost Dates
Frost dates for Niantic, IL, ZIP 62551
Around 04/14 is the usual last spring frost, about 229 days away. The first fall frost typically arrives around 10/24, about 192 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 Niantic, not a forecast for this year.
What to do before the first frost
Zone 6a around Niantic 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 04/14 isn't a guarantee
04/14 is the middle of 30 years of NOAA records, not a promise. Plant by 04/01 and you're betting against frost in roughly 9 years out of 10. 05/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Niantic compares
At roughly 192 frost-free days, Niantic places 20,512 of 40,283 ZIP codes in this dataset. Within IL, it ranks 434 of 1,548.
Learn more
local microclimates explains what one yard in Niantic can differ from the 62551 normal, and zone vs. frost date explains why Zone 6a and Niantic's frost date answer different questions.