Ypsilanti, MI 48198 Frost Dates
Ypsilanti, MI: when does the frost end?
Around 04/24 is the usual last spring frost, about 239 days away. Fall's first freeze usually shows up around 10/24, roughly 179 days after the last spring frost.
Ypsilanti 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
With roughly 8 weeks until Ypsilanti's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/24 isn't a guarantee
04/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/11 and only about 1 year in 10 sees frost after that.
Ypsilanti against the rest of the dataset
About 179 days separate Ypsilanti's last and first frost, putting it 25,201 of 40,283 ZIP codes nationally. Within MI, it ranks 90 of 1,153.
Learn more
Before leaning on 48198's figures: local microclimates explains what one yard in Ypsilanti can differ from the 48198 normal, while zone vs. frost date explains why Zone 6a and Ypsilanti's frost date answer different questions.