Webster, WI 54893 Frost Dates
54893, near Webster, WI: the frost window
Typically, the last spring freeze lands around 05/11, roughly 256 days out. Fall's first freeze usually shows up around 10/01, roughly 141 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Webster in Zone 4a (-30 to -25°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
Webster'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 05/11 isn't a guarantee
05/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/27 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.
Webster against the rest of the dataset
At roughly 141 frost-free days, Webster places 36,954 of 40,283 ZIP codes in this dataset. Within WI, it ranks 712 of 860.
Learn more
Two guides worth reading on 54893: local microclimates, on what one yard in Webster can differ from the 54893 normal, and zone vs. frost date, on why Zone 4a and Webster's frost date answer different questions.