Viola, IL 61486 Frost Dates
Viola, IL: when does the frost end?
The last spring frost here typically falls around 04/22, about 237 days from today. Fall's first freeze usually shows up around 10/19, roughly 181 days after the last spring frost.
Viola 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 Viola's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Viola's last frost
04/22 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Viola against the rest of the dataset
About 181 days separate Viola's last and first frost, putting it 24,650 of 40,283 ZIP codes nationally. Within IL, it ranks 923 of 1,548.
Learn more
Before leaning on 61486's figures: local microclimates explains what one yard in Viola can differ from the 61486 normal, while zone vs. frost date explains why Zone 5b and Viola's frost date answer different questions.