Eau Claire, WI 54703 Frost Dates
54703, near Eau Claire, WI: the frost window
Typically, the last spring freeze lands around 05/08, roughly 253 days out. Fall's first freeze usually shows up around 10/04, roughly 149 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 Eau Claire, not a forecast for this year.
Stretching the season past the first frost
Eau Claire'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 Eau Claire's last frost
05/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/24 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.
Eau Claire against the rest of the dataset
About 149 days separate Eau Claire's last and first frost, putting it 35,477 of 40,283 ZIP codes nationally. Within WI, it ranks 593 of 860.
Learn more
Two guides worth reading on 54703: the frost range, on how to read the range around Eau Claire's dates instead of trusting one, and local microclimates, on what one yard in Eau Claire can differ from the 54703 normal.