Magnolia, IL 61336 Frost Dates
Frost dates for Magnolia, IL, ZIP 61336
Around 04/20 is the usual last spring frost, about 235 days away. The first fall frost typically arrives around 10/17, about 178 frost-free days later.
Zone 5b (-15 to -10°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 Magnolia, not a forecast for this year.
What to do before the first frost
Zone 5b around Magnolia has about 7 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.
Why 04/20 isn't a guarantee
04/20 is the middle of 30 years of NOAA records, not a promise. Plant by 04/05 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 Magnolia compares
At roughly 178 frost-free days, Magnolia places 25,918 of 40,283 ZIP codes in this dataset. Within IL, it ranks 1,109 of 1,548.
Learn more
the frost range explains how to read the range around Magnolia's dates instead of trusting one, and local microclimates explains what one yard in Magnolia can differ from the 61336 normal.