Rhinelander, WI 54501 Frost Dates
54501, near Rhinelander, WI: the frost window
The last spring frost here typically falls around 05/26, about 271 days from today. Fall's first freeze usually shows up around 09/23, roughly 120 days after the last spring frost.
Zone 4b (-25 to -20°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 Rhinelander, not a forecast for this year.
Stretching the season past the first frost
Rhinelander's growing season runs out in roughly 4 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Rhinelander's last frost
05/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/08 and only about 1 year in 10 sees frost after that.
Rhinelander against the rest of the dataset
At roughly 120 frost-free days, Rhinelander places 39,073 of 40,283 ZIP codes in this dataset. Within WI, it ranks 845 of 860.
Learn more
Two guides worth reading on 54501: zone vs. frost date, on why Zone 4b and Rhinelander's frost date answer different questions, and the frost range, on how to read the range around Rhinelander's dates instead of trusting one.