Brown City, MI 48416 Frost Dates
Brown City, MI: when does the frost end?
Typically, the last spring freeze lands around 05/12, roughly 257 days out. Fall's first freeze usually shows up around 10/05, roughly 147 days after the last spring frost.
Brown City 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
With roughly 5 weeks until Brown City's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/12 isn't a guarantee
05/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/26 and only about 1 year in 10 sees frost after that.
Brown City against the rest of the dataset
Brown City's growing season runs about 147 days, ranking 35,935 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 864 of 1,153.
Learn more
Before leaning on 48416's figures: zone vs. frost date explains why Zone 6a and Brown City's frost date answer different questions, while the frost range explains how to read the range around Brown City's dates instead of trusting one.