Auburn, IL 62615 Frost Dates
Frost dates for Auburn, IL, ZIP 62615
Typically, the last spring freeze lands around 04/07, roughly 222 days out. The first fall frost typically arrives around 10/29, about 205 frost-free days later.
Auburn 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 Auburn has about 9 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.
How much risk comes with planting early here
04/07 is the middle of 30 years of NOAA records, not a promise. Plant by 03/22 and you're betting against frost in roughly 9 years out of 10. 04/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Auburn compares
About 205 days separate Auburn's last and first frost, putting it 16,245 of 40,283 ZIP codes nationally. Within IL, it ranks 110 of 1,548.
Learn more
local microclimates explains what one yard in Auburn can differ from the 62615 normal, and zone vs. frost date explains why Zone 6a and Auburn's frost date answer different questions.