Vienna, IL 62995 Frost Dates
Vienna, IL: when does the frost end?
Around 04/14 is the usual last spring frost, about 229 days away. Fall's first freeze usually shows up around 10/21, roughly 189 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Vienna in Zone 7a (0 to 5°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 Vienna's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/14 isn't a guarantee
04/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/30 and only about 1 year in 10 sees frost after that.
Vienna against the rest of the dataset
At roughly 189 frost-free days, Vienna places 21,627 of 40,283 ZIP codes in this dataset. Within IL, it ranks 615 of 1,548.
Learn more
Before leaning on 62995's figures: zone vs. frost date explains why Zone 7a and Vienna's frost date answer different questions, while the frost range explains how to read the range around Vienna's dates instead of trusting one.