Browntown, WI 53522 Frost Dates
Browntown, WI: when does the frost end?
Around 04/27 is the usual last spring frost, about 242 days away. Fall's first freeze usually shows up around 10/14, roughly 170 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Browntown in Zone 5a (-20 to -15°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 7 weeks until Browntown's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/27 isn't a guarantee
04/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/12 and only about 1 year in 10 sees frost after that.
Browntown against the rest of the dataset
About 170 days separate Browntown's last and first frost, putting it 29,232 of 40,283 ZIP codes nationally. Within WI, it ranks 130 of 860.
Learn more
Before leaning on 53522's figures: zone vs. frost date explains why Zone 5a and Browntown's frost date answer different questions, while the frost range explains how to read the range around Browntown's dates instead of trusting one.