Dahlgren, IL 62828 Frost Dates
Frost dates for Dahlgren, IL, ZIP 62828
Typically, the last spring freeze lands around 04/11, roughly 226 days out. The first fall frost typically arrives around 10/21, about 190 frost-free days later.
Dahlgren sits in USDA Zone 6b (-5 to 0°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 6b around Dahlgren 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.
The actual range around Dahlgren's last frost
04/11 is the middle of 30 years of NOAA records, not a promise. Plant by 03/27 and you're betting against frost in roughly 9 years out of 10. 04/26 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Dahlgren compares
At roughly 190 frost-free days, Dahlgren places 21,275 of 40,283 ZIP codes in this dataset. Within IL, it ranks 534 of 1,548.
Learn more
the frost range explains how to read the range around Dahlgren's dates instead of trusting one, and local microclimates explains what one yard in Dahlgren can differ from the 62828 normal.