White Lake, WI 54491 Frost Dates
Frost dates for White Lake, WI, ZIP 54491
Typically, the last spring freeze lands around 05/14, roughly 259 days out. The first fall frost typically arrives around 09/30, about 139 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 White Lake, not a forecast for this year.
What to do before the first frost
Zone 4b around White Lake 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.
The actual range around White Lake's last frost
05/14 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 05/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How White Lake compares
About 139 days separate White Lake's last and first frost, putting it 37,279 of 40,283 ZIP codes nationally. Within WI, it ranks 741 of 860.
Learn more
local microclimates explains what one yard in White Lake can differ from the 54491 normal, and zone vs. frost date explains why Zone 4b and White Lake's frost date answer different questions.