Royal Oak, MI 48073 Frost Dates
Royal Oak, MI: when does the frost end?
The last spring frost here typically falls around 05/01, about 246 days from today. 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 Royal Oak, not a forecast for this year.
Stretching the season past the first frost
With roughly 7 weeks until Royal Oak's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/01 isn't a guarantee
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.
Royal Oak against the rest of the dataset
At roughly 165 frost-free days, Royal Oak places 30,504 of 40,283 ZIP codes in this dataset. Within MI, it ranks 438 of 1,153.
Learn more
Before leaning on 48073's figures: local microclimates explains what one yard in Royal Oak can differ from the 48073 normal, while zone vs. frost date explains why Zone 6b and Royal Oak's frost date answer different questions.