Fountain City, WI 54629 Frost Dates
Frost dates for Fountain City, WI, ZIP 54629
The last spring frost here typically falls around 04/23, about 238 days from today. The first fall frost typically arrives around 10/21, about 180 frost-free days later.
Fountain City sits in USDA Zone 4b (-25 to -20°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
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.
Why 04/23 isn't a guarantee
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
About 180 days separate Fountain City's last and first frost, putting it 24,987 of 40,283 ZIP codes nationally. Within WI, it ranks 30 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 54629 normal.