South Haven, MN 55382 Frost Dates
Frost dates for South Haven, MN, ZIP 55382
The last spring frost here typically falls around 05/02, about 247 days from today. The first fall frost typically arrives around 10/05, about 156 frost-free days later.
Zone 4b (-25 to -20°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for South Haven, not a forecast for this year.
What to do before the first frost
Zone 4b around South Haven has about 5 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.
The actual range around South Haven's last frost
05/02 is the middle of 30 years of NOAA records, not a promise. Plant by 04/19 and you're betting against frost in roughly 9 years out of 10. 05/15 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 156 days, ranking 33,861 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 338 of 943.
Learn more
the frost range explains how to read the range around South Haven's dates instead of trusting one, and local microclimates explains what one yard in South Haven can differ from the 55382 normal.