Allouez, WI 54305 Frost Dates
54305, near Allouez, WI: the frost window
Around 04/30 is the usual last spring frost, about 245 days away. Fall's first freeze usually shows up around 10/09, roughly 161 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Allouez in Zone 5b (-15 to -10°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
Allouez's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/16 and only about 1 year in 10 sees frost after that.
Allouez against the rest of the dataset
About 161 days separate Allouez's last and first frost, putting it 31,989 of 40,283 ZIP codes nationally. Within WI, it ranks 313 of 860.
Learn more
Two guides worth reading on 54305: zone vs. frost date, on why Zone 5b and Allouez's frost date answer different questions, and the frost range, on how to read the range around Allouez's dates instead of trusting one.