Greendale, WI 53129 Frost Dates
53129, near Greendale, WI: the frost window
The last spring frost here typically falls around 05/03, about 248 days from today. Fall's first freeze usually shows up around 10/14, roughly 162 days after the last spring frost.
Zone 5b (-15 to -10°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Greendale, not a forecast for this year.
Stretching the season past the first frost
Greendale's growing season runs out in roughly 7 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
05/03 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 05/19 and only about 1 year in 10 sees frost after that.
Greendale against the rest of the dataset
At roughly 162 frost-free days, Greendale places 31,680 of 40,283 ZIP codes in this dataset. Within WI, it ranks 260 of 860.
Learn more
Two guides worth reading on 53129: local microclimates, on what one yard in Greendale can differ from the 53129 normal, and zone vs. frost date, on why Zone 5b and Greendale's frost date answer different questions.