Troy, MI 48099 Frost Dates
When can you plant in Troy, MI?
Typically, the last spring freeze lands around 05/01, roughly 246 days out. The first fall frost typically arrives around 10/17, about 165 frost-free days later.
The USDA Plant Hardiness Zone Map puts Troy in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 7 weeks of growing season left in Troy before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Troy's last frost
05/01 is the middle of 30 years of NOAA records, not a promise. Plant by 04/19 and you're betting against frost in roughly 9 years out of 10. 05/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Troy compares
Troy's growing season runs about 165 days, ranking 30,482 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 427 of 1,153.
Learn more
the frost range covers how to read the range around Troy's dates instead of trusting one. local microclimates covers what one yard in Troy can differ from the 48099 normal.