Eagle River, WI 54540 Frost Dates
Eagle River, WI: when does the frost end?
The last spring frost here typically falls around 05/25, about 270 days from today. Fall's first freeze usually shows up around 09/24, roughly 121 days after the last spring frost.
Zone 4a (-30 to -25°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
With roughly 4 weeks until Eagle River's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Eagle River's last frost
05/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/06 and only about 1 year in 10 sees frost after that.
Eagle River against the rest of the dataset
Eagle River's growing season runs about 121 days, ranking 39,013 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 842 of 860.
Learn more
Before leaning on 54540's figures: zone vs. frost date explains why Zone 4a and Eagle River's frost date answer different questions, while the frost range explains how to read the range around Eagle River's dates instead of trusting one.