South Haven, MI 49090 Frost Dates
When can you plant in South Haven, MI?
Typically, the last spring freeze lands around 04/17, roughly 232 days out. The first fall frost typically arrives around 11/05, about 201 frost-free days later.
The USDA Plant Hardiness Zone Map puts South Haven in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 10 weeks of growing season left in South Haven before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
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
South Haven's growing season runs about 201 days, ranking 17,505 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 3 of 1,153.
Learn more
the frost range covers how to read the range around South Haven's dates instead of trusting one. local microclimates covers what one yard in South Haven can differ from the 49090 normal.