Louisville, IL 62858 Frost Dates
Frost dates for Louisville, IL, ZIP 62858
Around 04/09 is the usual last spring frost, about 224 days away. The first fall frost typically arrives around 10/24, about 198 frost-free days later.
Zone 6b (-5 to 0°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Louisville, not a forecast for this year.
What to do before the first frost
Zone 6b around Louisville 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.
How much risk comes with planting early here
04/09 is the middle of 30 years of NOAA records, not a promise. Plant by 03/29 and you're betting against frost in roughly 9 years out of 10. 04/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Louisville compares
About 198 days separate Louisville's last and first frost, putting it 18,459 of 40,283 ZIP codes nationally. Within IL, it ranks 305 of 1,548.
Learn more
local microclimates explains what one yard in Louisville can differ from the 62858 normal, and zone vs. frost date explains why Zone 6b and Louisville's frost date answer different questions.