Matherville, IL 61276 Frost Dates
Frost dates for Matherville, IL, ZIP 61276
Typically, the last spring freeze lands around 04/22, roughly 237 days out. The first fall frost typically arrives around 10/19, about 181 frost-free days later.
Matherville 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 Matherville 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
04/22 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 Matherville compares
At roughly 181 frost-free days, Matherville places 24,669 of 40,283 ZIP codes in this dataset. Within IL, it ranks 929 of 1,548.
Learn more
the frost range explains how to read the range around Matherville's dates instead of trusting one, and local microclimates explains what one yard in Matherville can differ from the 61276 normal.