Alma, WI 54743 Frost Dates
When can you plant in Alma, WI?
Typically, the last spring freeze lands around 04/23, roughly 238 days out. The first fall frost typically arrives around 10/16, about 175 frost-free days later.
Alma 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
About 7 weeks of growing season left in Alma before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/23 isn't a guarantee
04/23 is the middle of 30 years of NOAA records, not a promise. Plant by 04/09 and you're betting against frost in roughly 9 years out of 10. 05/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Alma compares
About 175 days separate Alma's last and first frost, putting it 27,130 of 40,283 ZIP codes nationally. Within WI, it ranks 89 of 860.
Learn more
local microclimates covers what one yard in Alma can differ from the 54743 normal. zone vs. frost date covers why Zone 4b and Alma's frost date answer different questions.