Baldwin, WI 54002 Frost Dates
Frost dates for Baldwin, WI, ZIP 54002
Around 05/06 is the usual last spring frost, about 251 days away. The first fall frost typically arrives around 10/02, about 148 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 Baldwin, not a forecast for this year.
What to do before the first frost
Zone 4b around Baldwin 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.
How much risk comes with planting early here
05/06 is the middle of 30 years of NOAA records, not a promise. Plant by 04/21 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 Baldwin compares
About 148 days separate Baldwin's last and first frost, putting it 35,714 of 40,283 ZIP codes nationally. Within WI, it ranks 607 of 860.
Learn more
local microclimates explains what one yard in Baldwin can differ from the 54002 normal, and zone vs. frost date explains why Zone 4b and Baldwin's frost date answer different questions.