Cornell, WI 54745 Frost Dates
Frost dates for Cornell, WI, ZIP 54745
Around 05/05 is the usual last spring frost, about 250 days away. The first fall frost typically arrives around 10/02, about 149 frost-free days later.
The USDA Plant Hardiness Zone Map puts Cornell in Zone 4b (-25 to -20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 4b around Cornell has about 5 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
05/05 is the middle of 30 years of NOAA records, not a promise. Plant by 04/21 and you're betting against frost in roughly 9 years out of 10. 05/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Cornell compares
At roughly 149 frost-free days, Cornell places 35,532 of 40,283 ZIP codes in this dataset. Within WI, it ranks 596 of 860.
Learn more
local microclimates explains what one yard in Cornell can differ from the 54745 normal, and zone vs. frost date explains why Zone 4b and Cornell's frost date answer different questions.