River Grove, IL 60171 Frost Dates
When can you plant in River Grove, IL?
Typically, the last spring freeze lands around 04/16, roughly 231 days out. The first fall frost typically arrives around 10/28, about 193 frost-free days later.
The USDA Plant Hardiness Zone Map puts River Grove in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 9 weeks of growing season left in River Grove before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around River Grove's last frost
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. 05/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How River Grove compares
About 193 days separate River Grove's last and first frost, putting it 19,775 of 40,283 ZIP codes nationally. Within IL, it ranks 389 of 1,548.
Learn more
the frost range covers how to read the range around River Grove's dates instead of trusting one. local microclimates covers what one yard in River Grove can differ from the 60171 normal.