Detroit, MI 48201 Frost Dates
Frost dates for Detroit, MI, ZIP 48201
Typically, the last spring freeze lands around 04/21, roughly 236 days out. The first fall frost typically arrives around 10/31, about 190 frost-free days later.
Detroit sits in USDA Zone 6b (-5 to 0°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.
What to do before the first frost
Zone 6b around Detroit has about 9 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Detroit's last frost
04/21 is the middle of 30 years of NOAA records, not a promise. Plant by 04/07 and you're betting against frost in roughly 9 years out of 10. 05/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Detroit compares
At roughly 190 frost-free days, Detroit places 20,958 of 40,283 ZIP codes in this dataset. Within MI, it ranks 15 of 1,153.
Learn more
the frost range explains how to read the range around Detroit's dates instead of trusting one, and local microclimates explains what one yard in Detroit can differ from the 48201 normal.