Louisville/Jefferson County, KY 40219 Frost Dates
Frost dates for Louisville/Jefferson County, KY, ZIP 40219
Around 04/06 is the usual last spring frost, about 221 days away. The first fall frost typically arrives around 11/01, about 209 frost-free days later.
The USDA Plant Hardiness Zone Map puts Louisville/Jefferson County in Zone 7a (0 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 7a around Louisville/Jefferson County 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.
Why 04/06 isn't a guarantee
04/06 is the middle of 30 years of NOAA records, not a promise. Plant by 03/23 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/Jefferson County compares
About 209 days separate Louisville/Jefferson County's last and first frost, putting it 15,136 of 40,283 ZIP codes nationally. Within KY, it ranks 136 of 909.
Learn more
zone vs. frost date explains why Zone 7a and Louisville/Jefferson County's frost date answer different questions, and the frost range explains how to read the range around Louisville/Jefferson County's dates instead of trusting one.