Star Prairie, WI 54026 Frost Dates
Frost dates for Star Prairie, WI, ZIP 54026
The last spring frost here typically falls around 05/05, about 250 days from today. The first fall frost typically arrives around 10/04, about 151 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 Star Prairie, not a forecast for this year.
What to do before the first frost
Zone 4b around Star Prairie has about 5 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 05/05 isn't a guarantee
05/05 is the middle of 30 years of NOAA records, not a promise. Plant by 04/20 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 Star Prairie compares
At roughly 151 frost-free days, Star Prairie places 35,119 of 40,283 ZIP codes in this dataset. Within WI, it ranks 550 of 860.
Learn more
local microclimates explains what one yard in Star Prairie can differ from the 54026 normal, and zone vs. frost date explains why Zone 4b and Star Prairie's frost date answer different questions.