Suamico, WI 54173 Frost Dates
54173, near Suamico, WI: the frost window
Around 05/07 is the usual last spring frost, about 252 days away. Fall's first freeze usually shows up around 10/09, roughly 154 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Suamico in Zone 5b (-15 to -10°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
Suamico'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.
Why 05/07 isn't a guarantee
05/07 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 05/22 and only about 1 year in 10 sees frost after that.
Suamico against the rest of the dataset
Suamico's growing season runs about 154 days, ranking 34,237 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 469 of 860.
Learn more
Two guides worth reading on 54173: the frost range, on how to read the range around Suamico's dates instead of trusting one, and local microclimates, on what one yard in Suamico can differ from the 54173 normal.