Oreana, IL 62554 Frost Dates
Oreana, IL: when does the frost end?
Around 04/16 is the usual last spring frost, about 231 days away. Fall's first freeze usually shows up around 10/22, roughly 187 days after the last spring frost.
Zone 6a (-10 to -5°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 Oreana, not a forecast for this year.
Stretching the season past the first frost
With roughly 8 weeks until Oreana's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/16 isn't a guarantee
04/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/03 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.
Oreana against the rest of the dataset
Oreana's growing season runs about 187 days, ranking 22,505 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 772 of 1,548.
Learn more
Before leaning on 62554's figures: zone vs. frost date explains why Zone 6a and Oreana's frost date answer different questions, while the frost range explains how to read the range around Oreana's dates instead of trusting one.