Marshall, WI 53559 Frost Dates
53559, near Marshall, WI: the frost window
Typically, the last spring freeze lands around 04/30, roughly 245 days out. Fall's first freeze usually shows up around 10/09, roughly 163 days after the last spring frost.
Zone 5b (-15 to -10°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 Marshall, not a forecast for this year.
Stretching the season past the first frost
Marshall'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.
The actual range around Marshall's last frost
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 05/15 and only about 1 year in 10 sees frost after that.
Marshall against the rest of the dataset
About 163 days separate Marshall's last and first frost, putting it 31,386 of 40,283 ZIP codes nationally. Within WI, it ranks 228 of 860.
Learn more
Two guides worth reading on 53559: zone vs. frost date, on why Zone 5b and Marshall's frost date answer different questions, and the frost range, on how to read the range around Marshall's dates instead of trusting one.