Clear Lake, WI 54005 Frost Dates
Clear Lake, WI: when does the frost end?
Around 05/05 is the usual last spring frost, about 250 days away. Fall's first freeze usually shows up around 10/04, roughly 151 days after the last spring frost.
Clear Lake sits in USDA Zone 4b (-25 to -20°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 5 weeks until Clear Lake's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Clear Lake's last frost
05/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/20 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.
Clear Lake against the rest of the dataset
At roughly 151 frost-free days, Clear Lake places 35,089 of 40,283 ZIP codes in this dataset. Within WI, it ranks 547 of 860.
Learn more
Before leaning on 54005's figures: zone vs. frost date explains why Zone 4b and Clear Lake's frost date answer different questions, while the frost range explains how to read the range around Clear Lake's dates instead of trusting one.