Marine City, MI 48054 Frost Dates
48054, near Marine City, MI: the frost window
Typically, the last spring freeze lands around 05/03, roughly 248 days out. Fall's first freeze usually shows up around 10/18, roughly 167 days after the last spring frost.
Marine 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
Marine City's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/03 isn't a guarantee
05/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/23 and only about 1 year in 10 sees frost after that.
Marine City against the rest of the dataset
Marine City's growing season runs about 167 days, ranking 29,974 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 367 of 1,153.
Learn more
Two guides worth reading on 48054: zone vs. frost date, on why Zone 6a and Marine City's frost date answer different questions, and the frost range, on how to read the range around Marine City's dates instead of trusting one.