Mellen, WI 54855 Frost Dates
When can you plant in Mellen, WI?
Around 05/26 is the usual last spring frost, about 271 days away. The first fall frost typically arrives around 09/27, about 125 frost-free days later.
The USDA Plant Hardiness Zone Map puts Mellen 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
About 4 weeks of growing season left in Mellen before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/26 isn't a guarantee
05/26 is the middle of 30 years of NOAA records, not a promise. Plant by 05/08 and you're betting against frost in roughly 9 years out of 10. 06/09 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mellen compares
At roughly 125 frost-free days, Mellen places 38,787 of 40,283 ZIP codes in this dataset. Within WI, it ranks 819 of 860.
Learn more
local microclimates covers what one yard in Mellen can differ from the 54855 normal. zone vs. frost date covers why Zone 4b and Mellen's frost date answer different questions.