Marshfield, WI 54449 Frost Dates
54449, near Marshfield, WI: the frost window
Around 05/05 is the usual last spring frost, about 250 days away. Fall's first freeze usually shows up around 10/05, roughly 152 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Marshfield in Zone 4b (-25 to -20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Marshfield'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.
How much risk comes with planting early here
05/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/20 and only about 1 year in 10 sees frost after that.
Marshfield against the rest of the dataset
About 152 days separate Marshfield's last and first frost, putting it 34,706 of 40,283 ZIP codes nationally. Within WI, it ranks 515 of 860.
Learn more
Two guides worth reading on 54449: zone vs. frost date, on why Zone 4b and Marshfield's frost date answer different questions, and the frost range, on how to read the range around Marshfield's dates instead of trusting one.