Fredonia, WI 53021 Frost Dates
53021, near Fredonia, WI: the frost window
Around 05/05 is the usual last spring frost, about 250 days away. Fall's first freeze usually shows up around 10/12, roughly 159 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Fredonia in Zone 5b (-15 to -10°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
Fredonia'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.
Why 05/05 isn't a guarantee
05/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/22 and only about 1 year in 10 sees frost after that.
Fredonia against the rest of the dataset
About 159 days separate Fredonia's last and first frost, putting it 32,669 of 40,283 ZIP codes nationally. Within WI, it ranks 352 of 860.
Learn more
Two guides worth reading on 53021: the frost range, on how to read the range around Fredonia's dates instead of trusting one, and local microclimates, on what one yard in Fredonia can differ from the 53021 normal.