Brown Deer, WI 53223 Frost Dates
Frost dates for Brown Deer, WI, ZIP 53223
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.
Brown Deer sits in USDA Zone 6a (-10 to -5°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 6a around Brown Deer 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.
Why 04/26 isn't a guarantee
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 Brown Deer compares
Brown Deer's growing season runs about 173 days, ranking 27,813 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 108 of 860.
Learn more
the frost range explains how to read the range around Brown Deer's dates instead of trusting one, and local microclimates explains what one yard in Brown Deer can differ from the 53223 normal.