Ecorse, MI 48231 Frost Dates
48231, near Ecorse, MI: the frost window
Typically, the last spring freeze lands around 05/01, roughly 246 days out. Fall's first freeze usually shows up around 10/15, roughly 166 days after the last spring frost.
Ecorse sits in USDA Zone 6b (-5 to 0°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
Ecorse'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.
The actual range around Ecorse's last frost
05/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/18 and only about 1 year in 10 sees frost after that.
Ecorse against the rest of the dataset
Ecorse's growing season runs about 166 days, ranking 30,331 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 399 of 1,153.
Learn more
Two guides worth reading on 48231: local microclimates, on what one yard in Ecorse can differ from the 48231 normal, and zone vs. frost date, on why Zone 6b and Ecorse's frost date answer different questions.