Smithton, IL 62285 Frost Dates
Frost dates for Smithton, IL, ZIP 62285
The last spring frost here typically falls around 04/12, about 227 days from today. The first fall frost typically arrives around 10/20, about 189 frost-free days later.
The USDA Plant Hardiness Zone Map puts Smithton in Zone 7a (0 to 5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 7a around Smithton has about 8 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 04/12 isn't a guarantee
04/12 is the middle of 30 years of NOAA records, not a promise. Plant by 03/28 and you're betting against frost in roughly 9 years out of 10. 04/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Smithton compares
At roughly 189 frost-free days, Smithton places 21,574 of 40,283 ZIP codes in this dataset. Within IL, it ranks 603 of 1,548.
Learn more
the frost range explains how to read the range around Smithton's dates instead of trusting one, and local microclimates explains what one yard in Smithton can differ from the 62285 normal.