New Grand Chain, IL 62941 Frost Dates
When can you plant in New Grand Chain, IL?
Typically, the last spring freeze lands around 04/03, roughly 218 days out. The first fall frost typically arrives around 10/27, about 205 frost-free days later.
New Grand Chain sits in USDA Zone 7a (0 to 5°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
About 9 weeks of growing season left in New Grand Chain before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/03 isn't a guarantee
04/03 is the middle of 30 years of NOAA records, not a promise. Plant by 03/18 and you're betting against frost in roughly 9 years out of 10. 04/20 is the safer bet, historically only a 1-in-10 chance of frost that late.
How New Grand Chain compares
At roughly 205 frost-free days, New Grand Chain places 16,422 of 40,283 ZIP codes in this dataset. Within IL, it ranks 123 of 1,548.
Learn more
the frost range covers how to read the range around New Grand Chain's dates instead of trusting one. local microclimates covers what one yard in New Grand Chain can differ from the 62941 normal.