Eagle River, WI 54560 Frost Dates
54560, near Eagle River, WI: the frost window
Around 05/19 is the usual last spring frost, about 264 days away. Fall's first freeze usually shows up around 10/03, roughly 136 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 Eagle River, not a forecast for this year.
Stretching the season past the first frost
Eagle River's growing season runs out in roughly 5 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 Eagle River's last frost
05/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/31 and only about 1 year in 10 sees frost after that.
Eagle River against the rest of the dataset
At roughly 136 frost-free days, Eagle River places 37,707 of 40,283 ZIP codes in this dataset. Within WI, it ranks 757 of 860.
Learn more
Two guides worth reading on 54560: zone vs. frost date, on why Zone 4b and Eagle River's frost date answer different questions, and the frost range, on how to read the range around Eagle River's dates instead of trusting one.