Bloomington, WI 53802 Frost Dates
Frost dates for Bloomington, WI, ZIP 53802
The last spring frost here typically falls around 04/27, about 242 days from today. The first fall frost typically arrives around 10/11, about 166 frost-free days later.
The USDA Plant Hardiness Zone Map puts Bloomington 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 Bloomington 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 04/27 isn't a guarantee
04/27 is the middle of 30 years of NOAA records, not a promise. Plant by 04/11 and you're betting against frost in roughly 9 years out of 10. 05/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Bloomington compares
At roughly 166 frost-free days, Bloomington places 30,420 of 40,283 ZIP codes in this dataset. Within WI, it ranks 184 of 860.
Learn more
the frost range explains how to read the range around Bloomington's dates instead of trusting one, and local microclimates explains what one yard in Bloomington can differ from the 53802 normal.