Bloomfield, WI 53157 Frost Dates
Frost dates for Bloomfield, WI, ZIP 53157
Around 04/30 is the usual last spring frost, about 245 days away. The first fall frost typically arrives around 10/13, about 164 frost-free days later.
Bloomfield sits in USDA Zone 5b (-15 to -10°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 5b around Bloomfield 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.
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. 05/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Bloomfield compares
Bloomfield's growing season runs about 164 days, ranking 30,913 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 211 of 860.
Learn more
the frost range explains how to read the range around Bloomfield's dates instead of trusting one, and local microclimates explains what one yard in Bloomfield can differ from the 53157 normal.