Oconomowoc, WI 53066 Frost Dates
Oconomowoc, WI: when does the frost end?
Around 04/30 is the usual last spring frost, about 245 days away. Fall's first freeze usually shows up around 10/12, roughly 164 days after the last spring frost.
Oconomowoc sits in USDA Zone 5b (-15 to -10°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 6 weeks until Oconomowoc'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
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/17 and only about 1 year in 10 sees frost after that.
Oconomowoc against the rest of the dataset
Oconomowoc's growing season runs about 164 days, ranking 30,858 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 206 of 860.
Learn more
Before leaning on 53066's figures: the frost range explains how to read the range around Oconomowoc's dates instead of trusting one, while local microclimates explains what one yard in Oconomowoc can differ from the 53066 normal.