Ellisville, IL 61431 Frost Dates
Ellisville, 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 177 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 Ellisville, not a forecast for this year.
Stretching the season past the first frost
With roughly 7 weeks until Ellisville'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 05/08 and only about 1 year in 10 sees frost after that.
Ellisville against the rest of the dataset
At roughly 177 frost-free days, Ellisville places 26,306 of 40,283 ZIP codes in this dataset. Within IL, it ranks 1,143 of 1,548.
Learn more
Before leaning on 61431's figures: zone vs. frost date explains why Zone 6a and Ellisville's frost date answer different questions, while the frost range explains how to read the range around Ellisville's dates instead of trusting one.