New Haven, MI 48048 Frost Dates
48048, near New Haven, MI: the frost window
The last spring frost here typically falls around 04/30, about 245 days from today. Fall's first freeze usually shows up around 10/24, roughly 174 days after the last spring frost.
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.
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
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/15 and only about 1 year in 10 sees frost after that.
New Haven against the rest of the dataset
New Haven's growing season runs about 174 days, ranking 27,433 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 182 of 1,153.
Learn more
Two guides worth reading on 48048: local microclimates, on what one yard in New Haven can differ from the 48048 normal, and zone vs. frost date, on why Zone 6a and New Haven's frost date answer different questions.