Zionsville, IN 46075 Frost Dates
Frost dates for Zionsville, IN, ZIP 46075
Typically, the last spring freeze lands around 04/12, roughly 227 days out. The first fall frost typically arrives around 10/29, about 198 frost-free days later.
The USDA Plant Hardiness Zone Map puts Zionsville 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 Zionsville 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 04/12 isn't a guarantee
04/12 is the middle of 30 years of NOAA records, not a promise. Plant by 03/30 and you're betting against frost in roughly 9 years out of 10. 04/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Zionsville compares
About 198 days separate Zionsville's last and first frost, putting it 18,284 of 40,283 ZIP codes nationally. Within IN, it ranks 115 of 927.
Learn more
the frost range explains how to read the range around Zionsville's dates instead of trusting one, and local microclimates explains what one yard in Zionsville can differ from the 46075 normal.