DeForest, WI 53532 Frost Dates
Frost dates for DeForest, WI, ZIP 53532
The last spring frost here typically falls around 05/04, about 249 days from today. The first fall frost typically arrives around 10/06, about 154 frost-free days later.
DeForest sits in USDA Zone 5a (-20 to -15°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 5a around DeForest has about 6 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 05/04 isn't a guarantee
05/04 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. 05/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How DeForest compares
About 154 days separate DeForest's last and first frost, putting it 34,239 of 40,283 ZIP codes nationally. Within WI, it ranks 470 of 860.
Learn more
local microclimates explains what one yard in DeForest can differ from the 53532 normal, and zone vs. frost date explains why Zone 5a and DeForest's frost date answer different questions.