Viroqua, WI 54665 Frost Dates
Viroqua, WI: when does the frost end?
Typically, the last spring freeze lands around 05/07, roughly 252 days out. Fall's first freeze usually shows up around 10/02, roughly 148 days after the last spring frost.
Zone 5a (-20 to -15°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 Viroqua, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 weeks until Viroqua's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Viroqua's last frost
05/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/23 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.
Viroqua against the rest of the dataset
About 148 days separate Viroqua's last and first frost, putting it 35,713 of 40,283 ZIP codes nationally. Within WI, it ranks 606 of 860.
Learn more
Before leaning on 54665's figures: the frost range explains how to read the range around Viroqua's dates instead of trusting one, while local microclimates explains what one yard in Viroqua can differ from the 54665 normal.