Congerville, IL 61729 Frost Dates
When can you plant in Congerville, IL?
Typically, the last spring freeze lands around 04/21, roughly 236 days out. The first fall frost typically arrives around 10/17, about 178 frost-free days later.
The USDA Plant Hardiness Zone Map puts Congerville in Zone 5b (-15 to -10°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 7 weeks of growing season left in Congerville before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Congerville's last frost
04/21 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. 05/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Congerville compares
At roughly 178 frost-free days, Congerville places 25,875 of 40,283 ZIP codes in this dataset. Within IL, it ranks 1,100 of 1,548.
Learn more
local microclimates covers what one yard in Congerville can differ from the 61729 normal. zone vs. frost date covers why Zone 5b and Congerville's frost date answer different questions.