Oliver, WI 54836 Frost Dates
54836, near Oliver, WI: the frost window
Typically, the last spring freeze lands around 05/18, roughly 263 days out. Fall's first freeze usually shows up around 10/03, roughly 135 days after the last spring frost.
Oliver sits in USDA Zone 4a (-30 to -25°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
Oliver'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 05/18 isn't a guarantee
05/18 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/03 and only about 1 year in 10 sees frost after that.
Oliver against the rest of the dataset
About 135 days separate Oliver's last and first frost, putting it 37,913 of 40,283 ZIP codes nationally. Within WI, it ranks 781 of 860.
Learn more
Two guides worth reading on 54836: the frost range, on how to read the range around Oliver's dates instead of trusting one, and local microclimates, on what one yard in Oliver can differ from the 54836 normal.