New Haven, IN 46858 Frost Dates
46858, near New Haven, IN: the frost window
Typically, the last spring freeze lands around 04/24, roughly 239 days out. Fall's first freeze usually shows up around 10/21, roughly 178 days after the last spring frost.
New Haven sits in USDA Zone 6a (-10 to -5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
New Haven's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
04/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/10 and only about 1 year in 10 sees frost after that.
New Haven against the rest of the dataset
At roughly 178 frost-free days, New Haven places 25,605 of 40,283 ZIP codes in this dataset. Within IN, it ranks 564 of 927.
Learn more
Two guides worth reading on 46858: local microclimates, on what one yard in New Haven can differ from the 46858 normal, and zone vs. frost date, on why Zone 6a and New Haven's frost date answer different questions.