Burnham, IL 60633 Frost Dates
Frost dates for Burnham, IL, ZIP 60633
Around 04/10 is the usual last spring frost, about 225 days away. The first fall frost typically arrives around 11/01, about 203 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 Burnham, not a forecast for this year.
What to do before the first frost
Zone 6a around Burnham has about 9 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
04/10 is the middle of 30 years of NOAA records, not a promise. Plant by 03/30 and you're betting against frost in roughly 9 years out of 10. 04/26 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Burnham compares
At roughly 203 frost-free days, Burnham places 16,916 of 40,283 ZIP codes in this dataset. Within IL, it ranks 167 of 1,548.
Learn more
the frost range explains how to read the range around Burnham's dates instead of trusting one, and local microclimates explains what one yard in Burnham can differ from the 60633 normal.