Winnebago, IL 61126 Frost Dates
Winnebago, IL: when does the frost end?
Around 04/24 is the usual last spring frost, about 239 days away. Fall's first freeze usually shows up around 10/17, roughly 174 days after the last spring frost.
Winnebago 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 7 weeks until Winnebago's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Winnebago's last frost
04/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/08 and only about 1 year in 10 sees frost after that.
Winnebago against the rest of the dataset
About 174 days separate Winnebago's last and first frost, putting it 27,482 of 40,283 ZIP codes nationally. Within IL, it ranks 1,239 of 1,548.
Learn more
Before leaning on 61126's figures: the frost range explains how to read the range around Winnebago's dates instead of trusting one, while local microclimates explains what one yard in Winnebago can differ from the 61126 normal.