Fountain City, WI 54625 Frost Dates
Frost dates for Fountain City, WI, ZIP 54625
Typically, the last spring freeze lands around 04/23, roughly 238 days out. The first fall frost typically arrives around 10/21, about 180 frost-free days later.
Zone 4b (-25 to -20°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 Fountain City, not a forecast for this year.
What to do before the first frost
Zone 4b around Fountain City has about 8 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.
How much risk comes with planting early here
04/23 is the middle of 30 years of NOAA records, not a promise. Plant by 04/07 and you're betting against frost in roughly 9 years out of 10. 05/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Fountain City compares
Fountain City's growing season runs about 180 days, ranking 24,986 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 29 of 860.
Learn more
the frost range explains how to read the range around Fountain City's dates instead of trusting one, and local microclimates explains what one yard in Fountain City can differ from the 54625 normal.