Osseo, WI 54758 Frost Dates
Frost dates for Osseo, WI, ZIP 54758
The last spring frost here typically falls around 05/07, about 252 days from today. The first fall frost typically arrives around 10/01, about 146 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 Osseo, not a forecast for this year.
What to do before the first frost
Zone 4b around Osseo 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 Osseo's last frost
05/07 is the middle of 30 years of NOAA records, not a promise. Plant by 04/23 and you're betting against frost in roughly 9 years out of 10. 05/20 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Osseo compares
At roughly 146 frost-free days, Osseo places 36,056 of 40,283 ZIP codes in this dataset. Within WI, it ranks 638 of 860.
Learn more
the frost range explains how to read the range around Osseo's dates instead of trusting one, and local microclimates explains what one yard in Osseo can differ from the 54758 normal.