Iron Ridge, WI 53035 Frost Dates
Frost dates for Iron Ridge, WI, ZIP 53035
The last spring frost here typically falls around 05/01, about 246 days from today. The first fall frost typically arrives around 10/10, about 158 frost-free days later.
Zone 5a (-20 to -15°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Iron Ridge, not a forecast for this year.
What to do before the first frost
Zone 5a around Iron Ridge 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
05/01 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. 05/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Iron Ridge compares
Iron Ridge's growing season runs about 158 days, ranking 33,073 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 378 of 860.
Learn more
zone vs. frost date explains why Zone 5a and Iron Ridge's frost date answer different questions, and the frost range explains how to read the range around Iron Ridge's dates instead of trusting one.