Winslow, IL 61089 Frost Dates
Frost dates for Winslow, IL, ZIP 61089
The last spring frost here typically falls around 04/27, about 242 days from today. The first fall frost typically arrives around 10/09, about 165 frost-free days later.
Zone 5a (-20 to -15°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 Winslow, not a forecast for this year.
What to do before the first frost
Zone 5a around Winslow has about 6 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.
The actual range around Winslow's last frost
04/27 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Winslow compares
About 165 days separate Winslow's last and first frost, putting it 30,740 of 40,283 ZIP codes nationally. Within IL, it ranks 1,499 of 1,548.
Learn more
the frost range explains how to read the range around Winslow's dates instead of trusting one, and local microclimates explains what one yard in Winslow can differ from the 61089 normal.