New Haven, IN 46850 Frost Dates
46850, near New Haven, IN: the frost window
The last spring frost here typically falls around 04/24, about 239 days from today. 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.
The actual range around New Haven's last frost
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 25,597 of 40,283 ZIP codes in this dataset. Within IN, it ranks 556 of 927.
Learn more
Two guides worth reading on 46850: local microclimates, on what one yard in New Haven can differ from the 46850 normal, and zone vs. frost date, on why Zone 6a and New Haven's frost date answer different questions.