Troy, MI 48037 Frost Dates
When can you plant in Troy, MI?
Around 05/01 is the usual last spring frost, about 246 days away. 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
About 165 days separate Troy's last and first frost, putting it 30,480 of 40,283 ZIP codes nationally. Within MI, it ranks 425 of 1,153.
Learn more
zone vs. frost date covers why Zone 6b and Troy's frost date answer different questions. the frost range covers how to read the range around Troy's dates instead of trusting one.