Alma, WI 54610 Frost Dates
Alma, WI: when does the frost end?
Typically, the last spring freeze lands around 04/23, roughly 238 days out. Fall's first freeze usually shows up around 10/16, roughly 175 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 Alma, not a forecast for this year.
Stretching the season past the first frost
With roughly 7 weeks until Alma's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/23 isn't a guarantee
04/23 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Alma against the rest of the dataset
About 175 days separate Alma's last and first frost, putting it 27,129 of 40,283 ZIP codes nationally. Within WI, it ranks 88 of 860.
Learn more
Before leaning on 54610's figures: zone vs. frost date explains why Zone 4b and Alma's frost date answer different questions, while the frost range explains how to read the range around Alma's dates instead of trusting one.