Washburn, WI 54816 Frost Dates
When can you plant in Washburn, WI?
The last spring frost here typically falls around 05/20, about 265 days from today. The first fall frost typically arrives around 10/02, about 133 frost-free days later.
Zone 4b (-25 to -20°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 Washburn, not a forecast for this year.
What to do before the first frost
About 5 weeks of growing season left in Washburn before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Washburn's last frost
05/20 is the middle of 30 years of NOAA records, not a promise. Plant by 05/03 and you're betting against frost in roughly 9 years out of 10. 06/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Washburn compares
About 133 days separate Washburn's last and first frost, putting it 38,065 of 40,283 ZIP codes nationally. Within WI, it ranks 786 of 860.
Learn more
zone vs. frost date covers why Zone 4b and Washburn's frost date answer different questions. the frost range covers how to read the range around Washburn's dates instead of trusting one.