Kellnersville, WI 54215 Frost Dates
54215, near Kellnersville, 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 10/12, roughly 158 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Kellnersville 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
Kellnersville'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 05/06 isn't a guarantee
05/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/22 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.
Kellnersville against the rest of the dataset
At roughly 158 frost-free days, Kellnersville places 33,129 of 40,283 ZIP codes in this dataset. Within WI, it ranks 381 of 860.
Learn more
Two guides worth reading on 54215: zone vs. frost date, on why Zone 5b and Kellnersville's frost date answer different questions, and the frost range, on how to read the range around Kellnersville's dates instead of trusting one.