Saunemin, IL 61769 Frost Dates
Frost dates for Saunemin, IL, ZIP 61769
Around 04/16 is the usual last spring frost, about 231 days away. The first fall frost typically arrives around 10/24, about 191 frost-free days later.
Saunemin 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 Saunemin 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
04/16 is the middle of 30 years of NOAA records, not a promise. Plant by 04/03 and you're betting against frost in roughly 9 years out of 10. 05/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Saunemin compares
At roughly 191 frost-free days, Saunemin places 20,900 of 40,283 ZIP codes in this dataset. Within IL, it ranks 467 of 1,548.
Learn more
zone vs. frost date explains why Zone 5b and Saunemin's frost date answer different questions, and the frost range explains how to read the range around Saunemin's dates instead of trusting one.