New Haven, IN 46866 Frost Dates
Frost dates for New Haven, IN, ZIP 46866
The last spring frost here typically falls around 04/24, about 239 days from today. The first fall frost typically arrives around 10/21, about 178 frost-free days later.
Zone 6a (-10 to -5°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 New Haven, not a forecast for this year.
What to do before the first frost
Zone 6a around New Haven 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.
Why 04/24 isn't a guarantee
04/24 is the middle of 30 years of NOAA records, not a promise. Plant by 04/10 and you're betting against frost in roughly 9 years out of 10. 05/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How New Haven compares
About 178 days separate New Haven's last and first frost, putting it 25,612 of 40,283 ZIP codes nationally. Within IN, it ranks 571 of 927.
Learn more
zone vs. frost date explains why Zone 6a and New Haven's frost date answer different questions, and the frost range explains how to read the range around New Haven's dates instead of trusting one.