Blue Mounds, WI 53517 Frost Dates
When can you plant in Blue Mounds, WI?
The last spring frost here typically falls around 05/07, about 252 days from today. The first fall frost typically arrives around 10/01, about 148 frost-free days later.
The USDA Plant Hardiness Zone Map puts Blue Mounds 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
About 5 weeks of growing season left in Blue Mounds before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/07 isn't a guarantee
05/07 is the middle of 30 years of NOAA records, not a promise. Plant by 04/22 and you're betting against frost in roughly 9 years out of 10. 05/22 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Blue Mounds compares
At roughly 148 frost-free days, Blue Mounds places 35,756 of 40,283 ZIP codes in this dataset. Within WI, it ranks 616 of 860.
Learn more
the frost range covers how to read the range around Blue Mounds's dates instead of trusting one. local microclimates covers what one yard in Blue Mounds can differ from the 53517 normal.