Chatsworth, IL 60921 Frost Dates
When can you plant in Chatsworth, IL?
Typically, the last spring freeze lands around 04/25, roughly 240 days out. The first fall frost typically arrives around 10/20, about 175 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 Chatsworth, not a forecast for this year.
What to do before the first frost
About 8 weeks of growing season left in Chatsworth before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/25 isn't a guarantee
04/25 is the middle of 30 years of NOAA records, not a promise. Plant by 04/11 and you're betting against frost in roughly 9 years out of 10. 05/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Chatsworth compares
About 175 days separate Chatsworth's last and first frost, putting it 27,067 of 40,283 ZIP codes nationally. Within IL, it ranks 1,203 of 1,548.
Learn more
local microclimates covers what one yard in Chatsworth can differ from the 60921 normal. zone vs. frost date covers why Zone 6a and Chatsworth's frost date answer different questions.