Sublette, IL 61367 Frost Dates
Frost dates for Sublette, IL, ZIP 61367
Typically, the last spring freeze lands around 04/27, roughly 242 days out. The first fall frost typically arrives around 10/12, about 167 frost-free days later.
Sublette 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 Sublette has about 6 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.
The actual range around Sublette's last frost
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. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Sublette compares
Sublette's growing season runs about 167 days, ranking 30,164 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 1,461 of 1,548.
Learn more
zone vs. frost date explains why Zone 5b and Sublette's frost date answer different questions, and the frost range explains how to read the range around Sublette's dates instead of trusting one.