Fennville, MI 49408 Frost Dates
Frost dates for Fennville, MI, ZIP 49408
Typically, the last spring freeze lands around 04/28, roughly 243 days out. The first fall frost typically arrives around 10/21, about 175 frost-free days later.
Fennville 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 Fennville 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 04/28 isn't a guarantee
04/28 is the middle of 30 years of NOAA records, not a promise. Plant by 04/13 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 Fennville compares
About 175 days separate Fennville's last and first frost, putting it 27,011 of 40,283 ZIP codes nationally. Within MI, it ranks 150 of 1,153.
Learn more
local microclimates explains what one yard in Fennville can differ from the 49408 normal, and zone vs. frost date explains why Zone 6b and Fennville's frost date answer different questions.