Grand Haven, MI 49417 Frost Dates
Frost dates for Grand Haven, MI, ZIP 49417
Typically, the last spring freeze lands around 04/30, roughly 245 days out. The first fall frost typically arrives around 10/24, about 175 frost-free days later.
Grand Haven 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 Grand Haven has about 8 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.
Why 04/30 isn't a guarantee
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/17 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 Grand Haven compares
At roughly 175 frost-free days, Grand Haven places 26,798 of 40,283 ZIP codes in this dataset. Within MI, it ranks 137 of 1,153.
Learn more
local microclimates explains what one yard in Grand Haven can differ from the 49417 normal, and zone vs. frost date explains why Zone 6b and Grand Haven's frost date answer different questions.