Colona, IL 61241 Frost Dates
Colona, 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 10/18, roughly 176 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Colona in Zone 5b (-15 to -10°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 7 weeks until Colona's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/09 and only about 1 year in 10 sees frost after that.
Colona against the rest of the dataset
About 176 days separate Colona's last and first frost, putting it 26,439 of 40,283 ZIP codes nationally. Within IL, it ranks 1,172 of 1,548.
Learn more
Before leaning on 61241's figures: zone vs. frost date explains why Zone 5b and Colona's frost date answer different questions, while the frost range explains how to read the range around Colona's dates instead of trusting one.