Aledo, IL 61231 Frost Dates
Aledo, IL: when does the frost end?
Typically, the last spring freeze lands around 04/22, roughly 237 days out. Fall's first freeze usually shows up around 10/19, roughly 181 days after the last spring frost.
Aledo 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 Aledo's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/22 isn't a guarantee
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.
Aledo against the rest of the dataset
Aledo's growing season runs about 181 days, ranking 24,534 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 916 of 1,548.
Learn more
Before leaning on 61231's figures: local microclimates explains what one yard in Aledo can differ from the 61231 normal, while zone vs. frost date explains why Zone 5b and Aledo's frost date answer different questions.