Maiden Rock, WI 54750 Frost Dates
54750, near Maiden Rock, WI: the frost window
Around 05/13 is the usual last spring frost, about 258 days away. Fall's first freeze usually shows up around 09/29, roughly 139 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Maiden Rock in Zone 4b (-25 to -20°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
Maiden Rock'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.
Why 05/13 isn't a guarantee
05/13 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/27 and only about 1 year in 10 sees frost after that.
Maiden Rock against the rest of the dataset
Maiden Rock's growing season runs about 139 days, ranking 37,296 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 743 of 860.
Learn more
Two guides worth reading on 54750: the frost range, on how to read the range around Maiden Rock's dates instead of trusting one, and local microclimates, on what one yard in Maiden Rock can differ from the 54750 normal.