Mosinee, WI 54455 Frost Dates
54455, near Mosinee, WI: the frost window
Typically, the last spring freeze lands around 05/06, roughly 251 days out. Fall's first freeze usually shows up around 10/04, roughly 150 days after the last spring frost.
Zone 5a (-20 to -15°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 Mosinee, not a forecast for this year.
Stretching the season past the first frost
Mosinee'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 Mosinee's last frost
05/06 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.
Mosinee against the rest of the dataset
Mosinee's growing season runs about 150 days, ranking 35,282 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 563 of 860.
Learn more
Two guides worth reading on 54455: the frost range, on how to read the range around Mosinee's dates instead of trusting one, and local microclimates, on what one yard in Mosinee can differ from the 54455 normal.