Augusta, IL 62311 Frost Dates
Frost dates for Augusta, IL, ZIP 62311
Around 04/18 is the usual last spring frost, about 233 days away. The first fall frost typically arrives around 10/21, about 187 frost-free days later.
The USDA Plant Hardiness Zone Map puts Augusta in Zone 6a (-10 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 6a around Augusta 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 Augusta's last frost
04/18 is the middle of 30 years of NOAA records, not a promise. Plant by 04/03 and you're betting against frost in roughly 9 years out of 10. 05/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Augusta compares
At roughly 187 frost-free days, Augusta places 22,545 of 40,283 ZIP codes in this dataset. Within IL, it ranks 783 of 1,548.
Learn more
local microclimates explains what one yard in Augusta can differ from the 62311 normal, and zone vs. frost date explains why Zone 6a and Augusta's frost date answer different questions.