Knapp, WI 54749 Frost Dates
54749, near Knapp, WI: the frost window
Typically, the last spring freeze lands around 05/09, roughly 254 days out. Fall's first freeze usually shows up around 10/01, roughly 143 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Knapp 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
Knapp'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 05/09 isn't a guarantee
05/09 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 05/24 and only about 1 year in 10 sees frost after that.
Knapp against the rest of the dataset
About 143 days separate Knapp's last and first frost, putting it 36,593 of 40,283 ZIP codes nationally. Within WI, it ranks 695 of 860.
Learn more
Two guides worth reading on 54749: the frost range, on how to read the range around Knapp's dates instead of trusting one, and local microclimates, on what one yard in Knapp can differ from the 54749 normal.