Smithton, IL 62222 Frost Dates
62222, near Smithton, IL: the frost window
Around 04/12 is the usual last spring frost, about 227 days away. Fall's first freeze usually shows up around 10/20, roughly 189 days after the last spring frost.
Smithton sits in USDA Zone 7a (0 to 5°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
Smithton's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Smithton's last frost
04/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/28 and only about 1 year in 10 sees frost after that.
Smithton against the rest of the dataset
At roughly 189 frost-free days, Smithton places 21,573 of 40,283 ZIP codes in this dataset. Within IL, it ranks 602 of 1,548.
Learn more
Two guides worth reading on 62222: the frost range, on how to read the range around Smithton's dates instead of trusting one, and local microclimates, on what one yard in Smithton can differ from the 62222 normal.