Wauwatosa, WI 53222 Frost Dates
Frost dates for Wauwatosa, WI, ZIP 53222
Around 04/26 is the usual last spring frost, about 241 days away. The first fall frost typically arrives around 10/18, about 173 frost-free days later.
Zone 5b (-15 to -10°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 Wauwatosa, not a forecast for this year.
What to do before the first frost
Zone 5b around Wauwatosa has about 7 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 Wauwatosa's last frost
04/26 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Wauwatosa compares
About 173 days separate Wauwatosa's last and first frost, putting it 27,777 of 40,283 ZIP codes nationally. Within WI, it ranks 102 of 860.
Learn more
the frost range explains how to read the range around Wauwatosa's dates instead of trusting one, and local microclimates explains what one yard in Wauwatosa can differ from the 53222 normal.