Bolingbrook, IL 60490 Frost Dates
When can you plant in Bolingbrook, IL?
Typically, the last spring freeze lands around 04/20, roughly 235 days out. The first fall frost typically arrives around 10/22, about 184 frost-free days later.
Zone 6a (-10 to -5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Bolingbrook, not a forecast for this year.
What to do before the first frost
About 8 weeks of growing season left in Bolingbrook before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Bolingbrook's last frost
04/20 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 Bolingbrook compares
About 184 days separate Bolingbrook's last and first frost, putting it 23,404 of 40,283 ZIP codes nationally. Within IL, it ranks 863 of 1,548.
Learn more
local microclimates covers what one yard in Bolingbrook can differ from the 60490 normal. zone vs. frost date covers why Zone 6a and Bolingbrook's frost date answer different questions.