Pentwater, MI 49449 Frost Dates
Frost dates for Pentwater, MI, ZIP 49449
Typically, the last spring freeze lands around 05/17, roughly 262 days out. The first fall frost typically arrives around 10/07, about 144 frost-free days later.
Pentwater 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 Pentwater has about 6 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 05/17 isn't a guarantee
05/17 is the middle of 30 years of NOAA records, not a promise. Plant by 04/28 and you're betting against frost in roughly 9 years out of 10. 06/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Pentwater compares
About 144 days separate Pentwater's last and first frost, putting it 36,410 of 40,283 ZIP codes nationally. Within MI, it ranks 883 of 1,153.
Learn more
the frost range explains how to read the range around Pentwater's dates instead of trusting one, and local microclimates explains what one yard in Pentwater can differ from the 49449 normal.