Brighton, MI 48114 Frost Dates
48114, near Brighton, MI: the frost window
Typically, the last spring freeze lands around 05/06, roughly 251 days out. Fall's first freeze usually shows up around 10/12, roughly 157 days after the last spring frost.
Brighton 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
Brighton's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/06 isn't a guarantee
05/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/22 and only about 1 year in 10 sees frost after that.
Brighton against the rest of the dataset
Brighton's growing season runs about 157 days, ranking 33,287 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 720 of 1,153.
Learn more
Two guides worth reading on 48114: zone vs. frost date, on why Zone 6a and Brighton's frost date answer different questions, and the frost range, on how to read the range around Brighton's dates instead of trusting one.