Belleville, WI 53508 Frost Dates
53508, near Belleville, WI: the frost window
Typically, the last spring freeze lands around 05/01, roughly 246 days out. Fall's first freeze usually shows up around 10/09, roughly 161 days after the last spring frost.
Belleville sits in USDA Zone 5a (-20 to -15°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Belleville'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 05/01 isn't a guarantee
05/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/17 and only about 1 year in 10 sees frost after that.
Belleville against the rest of the dataset
Belleville's growing season runs about 161 days, ranking 32,052 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 323 of 860.
Learn more
Two guides worth reading on 53508: the frost range, on how to read the range around Belleville's dates instead of trusting one, and local microclimates, on what one yard in Belleville can differ from the 53508 normal.