Middleton, WI 53717 Frost Dates
Middleton, WI: when does the frost end?
The last spring frost here typically falls around 04/28, about 243 days from today. Fall's first freeze usually shows up around 10/15, roughly 169 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Middleton 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 7 weeks until Middleton'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
04/28 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/11 and only about 1 year in 10 sees frost after that.
Middleton against the rest of the dataset
Middleton's growing season runs about 169 days, ranking 29,337 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 134 of 860.
Learn more
Before leaning on 53717's figures: local microclimates explains what one yard in Middleton can differ from the 53717 normal, while zone vs. frost date explains why Zone 5b and Middleton's frost date answer different questions.