Green Bay, WI 54302 Frost Dates
When can you plant in Green Bay, WI?
Around 05/07 is the usual last spring frost, about 252 days away. The first fall frost typically arrives around 10/09, about 154 frost-free days later.
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 Green Bay, not a forecast for this year.
What to do before the first frost
About 6 weeks of growing season left in Green Bay before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
05/07 is the middle of 30 years of NOAA records, not a promise. Plant by 04/24 and you're betting against frost in roughly 9 years out of 10. 05/22 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Green Bay compares
At roughly 154 frost-free days, Green Bay places 34,200 of 40,283 ZIP codes in this dataset. Within WI, it ranks 453 of 860.
Learn more
the frost range covers how to read the range around Green Bay's dates instead of trusting one. local microclimates covers what one yard in Green Bay can differ from the 54302 normal.