Aniwa, WI 54408 Frost Dates
54408, near Aniwa, WI: the frost window
Typically, the last spring freeze lands around 05/14, roughly 259 days out. Fall's first freeze usually shows up around 09/30, roughly 139 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Aniwa 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
Aniwa'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.
How much risk comes with planting early here
05/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/28 and only about 1 year in 10 sees frost after that.
Aniwa against the rest of the dataset
Aniwa's growing season runs about 139 days, ranking 37,284 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 742 of 860.
Learn more
Two guides worth reading on 54408: zone vs. frost date, on why Zone 4b and Aniwa's frost date answer different questions, and the frost range, on how to read the range around Aniwa's dates instead of trusting one.