New Berlin, WI 53146 Frost Dates
When can you plant in New Berlin, WI?
The last spring frost here typically falls around 05/01, about 246 days from today. The first fall frost typically arrives around 10/13, about 162 frost-free days later.
The USDA Plant Hardiness Zone Map puts New Berlin 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
About 7 weeks of growing season left in New Berlin before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
05/01 is the middle of 30 years of NOAA records, not a promise. Plant by 04/18 and you're betting against frost in roughly 9 years out of 10. 05/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How New Berlin compares
About 162 days separate New Berlin's last and first frost, putting it 31,625 of 40,283 ZIP codes nationally. Within WI, it ranks 253 of 860.
Learn more
zone vs. frost date covers why Zone 5b and New Berlin's frost date answer different questions. the frost range covers how to read the range around New Berlin's dates instead of trusting one.