Port Washington, WI 53074 Frost Dates
Port Washington, WI: when does the frost end?
Around 04/27 is the usual last spring frost, about 242 days away. Fall's first freeze usually shows up around 10/22, roughly 176 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Port Washington in Zone 5b (-15 to -10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 8 weeks until Port Washington's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/14 and only about 1 year in 10 sees frost after that.
Port Washington against the rest of the dataset
Port Washington's growing season runs about 176 days, ranking 26,398 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 83 of 860.
Learn more
Before leaning on 53074's figures: zone vs. frost date explains why Zone 5b and Port Washington's frost date answer different questions, while the frost range explains how to read the range around Port Washington's dates instead of trusting one.