Marathon City, WI 54448 Frost Dates
54448, near Marathon City, WI: the frost window
Typically, the last spring freeze lands around 05/06, roughly 251 days out. Fall's first freeze usually shows up around 10/04, roughly 150 days after the last spring frost.
Marathon City sits in USDA Zone 4b (-25 to -20°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
Marathon City's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/06 isn't a guarantee
05/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/21 and only about 1 year in 10 sees frost after that.
Marathon City against the rest of the dataset
At roughly 150 frost-free days, Marathon City places 35,321 of 40,283 ZIP codes in this dataset. Within WI, it ranks 569 of 860.
Learn more
Two guides worth reading on 54448: zone vs. frost date, on why Zone 4b and Marathon City's frost date answer different questions, and the frost range, on how to read the range around Marathon City's dates instead of trusting one.