Poplar, WI 54865 Frost Dates
Frost dates for Poplar, WI, ZIP 54865
Around 05/24 is the usual last spring frost, about 269 days away. The first fall frost typically arrives around 09/26, about 124 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 Poplar, not a forecast for this year.
What to do before the first frost
Zone 5a around Poplar has about 4 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 05/24 isn't a guarantee
05/24 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. 06/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Poplar compares
Poplar's growing season runs about 124 days, ranking 38,861 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 835 of 860.
Learn more
local microclimates explains what one yard in Poplar can differ from the 54865 normal, and zone vs. frost date explains why Zone 5a and Poplar's frost date answer different questions.