Romulus, MI 48242 Frost Dates
48242, near Romulus, MI: the frost window
The last spring frost here typically falls around 04/20, about 235 days from today. Fall's first freeze usually shows up around 10/27, roughly 188 days after the last spring frost.
Zone 6b (-5 to 0°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 Romulus, not a forecast for this year.
Stretching the season past the first frost
Romulus's growing season runs out in roughly 9 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 Romulus's last frost
04/20 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/06 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/08 and only about 1 year in 10 sees frost after that.
Romulus against the rest of the dataset
At roughly 188 frost-free days, Romulus places 21,864 of 40,283 ZIP codes in this dataset. Within MI, it ranks 51 of 1,153.
Learn more
Two guides worth reading on 48242: zone vs. frost date, on why Zone 6b and Romulus's frost date answer different questions, and the frost range, on how to read the range around Romulus's dates instead of trusting one.