Curtiss, WI 54422 Frost Dates
Frost dates for Curtiss, WI, ZIP 54422
The last spring frost here typically falls around 05/13, about 258 days from today. The first fall frost typically arrives around 09/26, about 136 frost-free days later.
Curtiss 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 Curtiss has about 4 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
05/13 is the middle of 30 years of NOAA records, not a promise. Plant by 04/29 and you're betting against frost in roughly 9 years out of 10. 05/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Curtiss compares
At roughly 136 frost-free days, Curtiss places 37,785 of 40,283 ZIP codes in this dataset. Within WI, it ranks 764 of 860.
Learn more
zone vs. frost date explains why Zone 4b and Curtiss's frost date answer different questions, and the frost range explains how to read the range around Curtiss's dates instead of trusting one.