Milltown, WI 54006 Frost Dates
54006, near Milltown, WI: the frost window
Around 05/19 is the usual last spring frost, about 264 days away. Fall's first freeze usually shows up around 09/25, roughly 128 days after the last spring frost.
Zone 4a (-30 to -25°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 Milltown, not a forecast for this year.
Stretching the season past the first frost
Milltown's growing season runs out in roughly 4 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 Milltown's last frost
05/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/03 and only about 1 year in 10 sees frost after that.
Milltown against the rest of the dataset
At roughly 128 frost-free days, Milltown places 38,553 of 40,283 ZIP codes in this dataset. Within WI, it ranks 800 of 860.
Learn more
Two guides worth reading on 54006: local microclimates, on what one yard in Milltown can differ from the 54006 normal, and zone vs. frost date, on why Zone 4a and Milltown's frost date answer different questions.