Butternut, WI 54514 Frost Dates
Frost dates for Butternut, WI, ZIP 54514
Typically, the last spring freeze lands around 05/22, roughly 267 days out. The first fall frost typically arrives around 09/24, about 126 frost-free days later.
The USDA Plant Hardiness Zone Map puts Butternut in Zone 4a (-30 to -25°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 4a around Butternut 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
05/22 is the middle of 30 years of NOAA records, not a promise. Plant by 05/06 and you're betting against frost in roughly 9 years out of 10. 06/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Butternut compares
At roughly 126 frost-free days, Butternut places 38,718 of 40,283 ZIP codes in this dataset. Within WI, it ranks 813 of 860.
Learn more
local microclimates explains what one yard in Butternut can differ from the 54514 normal, and zone vs. frost date explains why Zone 4a and Butternut's frost date answer different questions.