Mount Sterling, WI 54645 Frost Dates
When can you plant in Mount Sterling, WI?
Around 05/03 is the usual last spring frost, about 248 days away. The first fall frost typically arrives around 10/07, about 156 frost-free days later.
Zone 5a (-20 to -15°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Mount Sterling, not a forecast for this year.
What to do before the first frost
About 6 weeks of growing season left in Mount Sterling before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Mount Sterling's last frost
05/03 is the middle of 30 years of NOAA records, not a promise. Plant by 04/19 and you're betting against frost in roughly 9 years out of 10. 05/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mount Sterling compares
At roughly 156 frost-free days, Mount Sterling places 33,858 of 40,283 ZIP codes in this dataset. Within WI, it ranks 430 of 860.
Learn more
local microclimates covers what one yard in Mount Sterling can differ from the 54645 normal. zone vs. frost date covers why Zone 5a and Mount Sterling's frost date answer different questions.