New Haven, IN 46857 Frost Dates
Frost dates for New Haven, IN, ZIP 46857
Around 04/24 is the usual last spring frost, about 239 days away. 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.
How much risk comes with planting early here
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
New Haven's growing season runs about 178 days, ranking 25,604 of 40,283 US ZIP codes measured here, longest to shortest. Within IN, it ranks 563 of 927.
Learn more
local microclimates explains what one yard in New Haven can differ from the 46857 normal, and zone vs. frost date explains why Zone 6a and New Haven's frost date answer different questions.