Fennimore, WI 53825 Frost Dates
Frost dates for Fennimore, WI, ZIP 53825
Typically, the last spring freeze lands around 04/27, roughly 242 days out. The first fall frost typically arrives around 10/11, about 166 frost-free days later.
Fennimore sits in USDA Zone 5a (-20 to -15°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 5a around Fennimore has about 6 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 04/27 isn't a guarantee
04/27 is the middle of 30 years of NOAA records, not a promise. Plant by 04/11 and you're betting against frost in roughly 9 years out of 10. 05/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Fennimore compares
At roughly 166 frost-free days, Fennimore places 30,378 of 40,283 ZIP codes in this dataset. Within WI, it ranks 178 of 860.
Learn more
the frost range explains how to read the range around Fennimore's dates instead of trusting one, and local microclimates explains what one yard in Fennimore can differ from the 53825 normal.