Granton, WI 54436 Frost Dates
54436, near Granton, WI: the frost window
Around 05/10 is the usual last spring frost, about 255 days away. Fall's first freeze usually shows up around 10/01, roughly 144 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Granton 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
Granton'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.
How much risk comes with planting early here
05/10 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/26 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/25 and only about 1 year in 10 sees frost after that.
Granton against the rest of the dataset
Granton's growing season runs about 144 days, ranking 36,453 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 681 of 860.
Learn more
Two guides worth reading on 54436: local microclimates, on what one yard in Granton can differ from the 54436 normal, and zone vs. frost date, on why Zone 4b and Granton's frost date answer different questions.