Palmyra, WI 53156 Frost Dates
When can you plant in Palmyra, WI?
Around 05/03 is the usual last spring frost, about 248 days away. The first fall frost typically arrives around 10/09, about 157 frost-free days later.
Zone 5b (-15 to -10°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 Palmyra, not a forecast for this year.
What to do before the first frost
About 6 weeks of growing season left in Palmyra before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
05/03 is the middle of 30 years of NOAA records, not a promise. Plant by 04/18 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 Palmyra compares
About 157 days separate Palmyra's last and first frost, putting it 33,347 of 40,283 ZIP codes nationally. Within WI, it ranks 394 of 860.
Learn more
zone vs. frost date covers why Zone 5b and Palmyra's frost date answer different questions. the frost range covers how to read the range around Palmyra's dates instead of trusting one.