Heyworth, IL 61772 Frost Dates
Frost dates for Heyworth, IL, ZIP 61772
The last spring frost here typically falls around 04/25, about 240 days from today. The first fall frost typically arrives around 10/16, about 172 frost-free days later.
Heyworth sits in USDA Zone 6a (-10 to -5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 6a around Heyworth 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 04/25 isn't a guarantee
04/25 is the middle of 30 years of NOAA records, not a promise. Plant by 04/11 and you're betting against frost in roughly 9 years out of 10. 05/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Heyworth compares
About 172 days separate Heyworth's last and first frost, putting it 28,302 of 40,283 ZIP codes nationally. Within IL, it ranks 1,344 of 1,548.
Learn more
local microclimates explains what one yard in Heyworth can differ from the 61772 normal, and zone vs. frost date explains why Zone 6a and Heyworth's frost date answer different questions.