Ferryville, WI 54628 Frost Dates
54628, near Ferryville, WI: the frost window
Around 05/03 is the usual last spring frost, about 248 days away. Fall's first freeze usually shows up around 10/07, roughly 156 days after the last spring frost.
Zone 5a (-20 to -15°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 Ferryville, not a forecast for this year.
Stretching the season past the first frost
Ferryville's growing season runs out in roughly 6 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
05/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/18 and only about 1 year in 10 sees frost after that.
Ferryville against the rest of the dataset
Ferryville's growing season runs about 156 days, ranking 33,855 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 429 of 860.
Learn more
Two guides worth reading on 54628: zone vs. frost date, on why Zone 5a and Ferryville's frost date answer different questions, and the frost range, on how to read the range around Ferryville's dates instead of trusting one.