Olney, IL 62450 Frost Dates
Olney, IL: when does the frost end?
The last spring frost here typically falls around 04/15, about 230 days from today. Fall's first freeze usually shows up around 10/23, roughly 189 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Olney in Zone 6b (-5 to 0°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 Olney's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Olney's last frost
04/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/03 and only about 1 year in 10 sees frost after that.
Olney against the rest of the dataset
About 189 days separate Olney's last and first frost, putting it 21,489 of 40,283 ZIP codes nationally. Within IL, it ranks 580 of 1,548.
Learn more
Before leaning on 62450's figures: local microclimates explains what one yard in Olney can differ from the 62450 normal, while zone vs. frost date explains why Zone 6b and Olney's frost date answer different questions.