Bay City, WI 54723 Frost Dates
Bay City, WI: when does the frost end?
Typically, the last spring freeze lands around 04/23, roughly 238 days out. Fall's first freeze usually shows up around 10/14, roughly 173 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Bay City 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
With roughly 7 weeks until Bay City's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Bay City's last frost
04/23 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/08 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/07 and only about 1 year in 10 sees frost after that.
Bay City against the rest of the dataset
Bay City's growing season runs about 173 days, ranking 28,055 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 117 of 860.
Learn more
Before leaning on 54723's figures: zone vs. frost date explains why Zone 4b and Bay City's frost date answer different questions, while the frost range explains how to read the range around Bay City's dates instead of trusting one.