Hartsburg, IL 62643 Frost Dates
Frost dates for Hartsburg, IL, ZIP 62643
The last spring frost here typically falls around 04/20, about 235 days from today. The first fall frost typically arrives around 10/16, about 179 frost-free days later.
Hartsburg 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 Hartsburg 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.
The actual range around Hartsburg's last frost
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. 05/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hartsburg compares
At roughly 179 frost-free days, Hartsburg places 25,491 of 40,283 ZIP codes in this dataset. Within IL, it ranks 1,071 of 1,548.
Learn more
zone vs. frost date explains why Zone 6a and Hartsburg's frost date answer different questions, and the frost range explains how to read the range around Hartsburg's dates instead of trusting one.