Harper Woods, MI 48205 Frost Dates
Frost dates for Harper Woods, MI, ZIP 48205
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.
Harper Woods 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 Harper Woods 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.
How much risk comes with planting early here
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 Harper Woods compares
At roughly 190 frost-free days, Harper Woods places 21,072 of 40,283 ZIP codes in this dataset. Within MI, it ranks 31 of 1,153.
Learn more
local microclimates explains what one yard in Harper Woods can differ from the 48205 normal, and zone vs. frost date explains why Zone 6b and Harper Woods's frost date answer different questions.