De Soto, IL 62924 Frost Dates
De Soto, IL: when does the frost end?
Around 04/09 is the usual last spring frost, about 224 days away. Fall's first freeze usually shows up around 10/22, roughly 195 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts De Soto 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 De Soto's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/09 isn't a guarantee
04/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/25 and only about 1 year in 10 sees frost after that.
De Soto against the rest of the dataset
De Soto's growing season runs about 195 days, ranking 19,297 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 341 of 1,548.
Learn more
Before leaning on 62924's figures: zone vs. frost date explains why Zone 7a and De Soto's frost date answer different questions, while the frost range explains how to read the range around De Soto's dates instead of trusting one.