Whitehall, WI 54773 Frost Dates
When can you plant in Whitehall, WI?
Typically, the last spring freeze lands around 05/09, roughly 254 days out. The first fall frost typically arrives around 10/01, about 143 frost-free days later.
Whitehall 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
About 5 weeks of growing season left in Whitehall before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/09 isn't a guarantee
05/09 is the middle of 30 years of NOAA records, not a promise. Plant by 04/28 and you're betting against frost in roughly 9 years out of 10. 05/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Whitehall compares
About 143 days separate Whitehall's last and first frost, putting it 36,554 of 40,283 ZIP codes nationally. Within WI, it ranks 690 of 860.
Learn more
the frost range covers how to read the range around Whitehall's dates instead of trusting one. local microclimates covers what one yard in Whitehall can differ from the 54773 normal.