Oshkosh, WI 54904 Frost Dates
Oshkosh, WI: when does the frost end?
Around 04/24 is the usual last spring frost, about 239 days away. Fall's first freeze usually shows up around 10/20, roughly 178 days after the last spring frost.
Oshkosh sits in USDA Zone 5b (-15 to -10°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.
Stretching the season past the first frost
With roughly 8 weeks until Oshkosh's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/08 and only about 1 year in 10 sees frost after that.
Oshkosh against the rest of the dataset
At roughly 178 frost-free days, Oshkosh places 25,567 of 40,283 ZIP codes in this dataset. Within WI, it ranks 46 of 860.
Learn more
Before leaning on 54904's figures: the frost range explains how to read the range around Oshkosh's dates instead of trusting one, while local microclimates explains what one yard in Oshkosh can differ from the 54904 normal.