Hilbert, WI 54123 Frost Dates
54123, near Hilbert, 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 10/06, roughly 151 days after the last spring frost.
Zone 5b (-15 to -10°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 Hilbert, not a forecast for this year.
Stretching the season past the first frost
Hilbert'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 05/21 and only about 1 year in 10 sees frost after that.
Hilbert against the rest of the dataset
About 151 days separate Hilbert's last and first frost, putting it 35,074 of 40,283 ZIP codes nationally. Within WI, it ranks 541 of 860.
Learn more
Two guides worth reading on 54123: the frost range, on how to read the range around Hilbert's dates instead of trusting one, and local microclimates, on what one yard in Hilbert can differ from the 54123 normal.