Brooklyn, WI 53521 Frost Dates
Frost dates for Brooklyn, WI, ZIP 53521
Typically, the last spring freeze lands around 04/30, roughly 245 days out. The first fall frost typically arrives around 10/11, about 163 frost-free days later.
The USDA Plant Hardiness Zone Map puts Brooklyn in Zone 5b (-15 to -10°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 5b around Brooklyn 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.
How much risk comes with planting early here
04/30 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. 05/15 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Brooklyn compares
At roughly 163 frost-free days, Brooklyn places 31,427 of 40,283 ZIP codes in this dataset. Within WI, it ranks 236 of 860.
Learn more
the frost range explains how to read the range around Brooklyn's dates instead of trusting one, and local microclimates explains what one yard in Brooklyn can differ from the 53521 normal.