South Haven, MI 49063 Frost Dates
Frost dates for South Haven, MI, ZIP 49063
Around 04/17 is the usual last spring frost, about 232 days away. The first fall frost typically arrives around 11/05, about 201 frost-free days later.
South 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 South Haven has about 10 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 04/17 isn't a guarantee
04/17 is the middle of 30 years of NOAA records, not a promise. Plant by 04/03 and you're betting against frost in roughly 9 years out of 10. 05/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How South Haven compares
About 201 days separate South Haven's last and first frost, putting it 17,504 of 40,283 ZIP codes nationally. Within MI, it ranks 2 of 1,153.
Learn more
zone vs. frost date explains why Zone 6b and South Haven's frost date answer different questions, and the frost range explains how to read the range around South Haven's dates instead of trusting one.