Sheridan, IL 60551 Frost Dates
Frost dates for Sheridan, IL, ZIP 60551
Typically, the last spring freeze lands around 04/27, roughly 242 days out. The first fall frost typically arrives around 10/17, about 171 frost-free days later.
Sheridan sits in USDA Zone 5b (-15 to -10°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 5b around Sheridan 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
04/27 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Sheridan compares
Sheridan's growing season runs about 171 days, ranking 28,676 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 1,374 of 1,548.
Learn more
local microclimates explains what one yard in Sheridan can differ from the 60551 normal, and zone vs. frost date explains why Zone 5b and Sheridan's frost date answer different questions.