Tomah, WI 54662 Frost Dates
Frost dates for Tomah, WI, ZIP 54662
Typically, the last spring freeze lands around 05/09, roughly 254 days out. The first fall frost typically arrives around 10/01, about 144 frost-free days later.
The USDA Plant Hardiness Zone Map puts Tomah in Zone 4b (-25 to -20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 4b around Tomah 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 Tomah's last frost
05/09 is the middle of 30 years of NOAA records, not a promise. Plant by 04/26 and you're betting against frost in roughly 9 years out of 10. 05/22 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Tomah compares
About 144 days separate Tomah's last and first frost, putting it 36,351 of 40,283 ZIP codes nationally. Within WI, it ranks 666 of 860.
Learn more
the frost range explains how to read the range around Tomah's dates instead of trusting one, and local microclimates explains what one yard in Tomah can differ from the 54662 normal.