Theresa, WI 53091 Frost Dates
Frost dates for Theresa, WI, ZIP 53091
The last spring frost here typically falls around 05/01, about 246 days from today. The first fall frost typically arrives around 10/10, about 158 frost-free days later.
The USDA Plant Hardiness Zone Map puts Theresa in Zone 5a (-20 to -15°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 5a around Theresa 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 05/01 isn't a guarantee
05/01 is the middle of 30 years of NOAA records, not a promise. Plant by 04/16 and you're betting against frost in roughly 9 years out of 10. 05/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Theresa compares
About 158 days separate Theresa's last and first frost, putting it 33,045 of 40,283 ZIP codes nationally. Within WI, it ranks 376 of 860.
Learn more
the frost range explains how to read the range around Theresa's dates instead of trusting one, and local microclimates explains what one yard in Theresa can differ from the 53091 normal.