Horicon, WI 53922 Frost Dates
Horicon, WI: when does the frost end?
The last spring frost here typically falls around 05/01, about 246 days from today. Fall's first freeze usually shows up around 10/10, roughly 158 days after the last spring frost.
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 Horicon, not a forecast for this year.
Stretching the season past the first frost
With roughly 6 weeks until Horicon's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/01 isn't a guarantee
05/01 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 05/19 and only about 1 year in 10 sees frost after that.
Horicon against the rest of the dataset
At roughly 158 frost-free days, Horicon places 32,977 of 40,283 ZIP codes in this dataset. Within WI, it ranks 364 of 860.
Learn more
Before leaning on 53922's figures: local microclimates explains what one yard in Horicon can differ from the 53922 normal, while zone vs. frost date explains why Zone 5a and Horicon's frost date answer different questions.