Egg Harbor, WI 54209 Frost Dates
Frost dates for Egg Harbor, WI, ZIP 54209
Around 05/08 is the usual last spring frost, about 253 days away. The first fall frost typically arrives around 10/13, about 157 frost-free days later.
The USDA Plant Hardiness Zone Map puts Egg Harbor in Zone 5b (-15 to -10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 5b around Egg Harbor has about 7 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 05/08 isn't a guarantee
05/08 is the middle of 30 years of NOAA records, not a promise. Plant by 04/25 and you're betting against frost in roughly 9 years out of 10. 05/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Egg Harbor compares
Egg Harbor's growing season runs about 157 days, ranking 33,437 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 406 of 860.
Learn more
local microclimates explains what one yard in Egg Harbor can differ from the 54209 normal, and zone vs. frost date explains why Zone 5b and Egg Harbor's frost date answer different questions.