Southfield, MI 48240 Frost Dates
Southfield, MI: when does the frost end?
Typically, the last spring freeze lands around 05/01, roughly 246 days out. Fall's first freeze usually shows up around 10/17, roughly 165 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 Southfield, not a forecast for this year.
Stretching the season past the first frost
With roughly 7 weeks until Southfield's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/16 and only about 1 year in 10 sees frost after that.
Southfield against the rest of the dataset
At roughly 165 frost-free days, Southfield places 30,489 of 40,283 ZIP codes in this dataset. Within MI, it ranks 434 of 1,153.
Learn more
Before leaning on 48240's figures: zone vs. frost date explains why Zone 6b and Southfield's frost date answer different questions, while the frost range explains how to read the range around Southfield's dates instead of trusting one.