Troy, MI 48085 Frost Dates
48085, near Troy, MI: the frost window
Around 04/21 is the usual last spring frost, about 236 days away. Fall's first freeze usually shows up around 10/31, roughly 190 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 Troy, not a forecast for this year.
Stretching the season past the first frost
Troy'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.
Why 04/21 isn't a guarantee
04/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Troy against the rest of the dataset
At roughly 190 frost-free days, Troy places 20,985 of 40,283 ZIP codes in this dataset. Within MI, it ranks 21 of 1,153.
Learn more
Two guides worth reading on 48085: the frost range, on how to read the range around Troy's dates instead of trusting one, and local microclimates, on what one yard in Troy can differ from the 48085 normal.