Collinsville, IL 62234 Frost Dates
When can you plant in Collinsville, IL?
Typically, the last spring freeze lands around 04/08, roughly 223 days out. The first fall frost typically arrives around 10/26, about 200 frost-free days later.
Zone 7a (0 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 Collinsville, not a forecast for this year.
What to do before the first frost
About 8 weeks of growing season left in Collinsville before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
04/08 is the middle of 30 years of NOAA records, not a promise. Plant by 03/23 and you're betting against frost in roughly 9 years out of 10. 04/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Collinsville compares
At roughly 200 frost-free days, Collinsville places 17,728 of 40,283 ZIP codes in this dataset. Within IL, it ranks 270 of 1,548.
Learn more
local microclimates covers what one yard in Collinsville can differ from the 62234 normal. zone vs. frost date covers why Zone 7a and Collinsville's frost date answer different questions.