Summerfield, IL 62289 Frost Dates
62289, near Summerfield, 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.
Summerfield sits in USDA Zone 6b (-5 to 0°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
Summerfield'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.
Why 04/12 isn't a guarantee
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.
Summerfield against the rest of the dataset
At roughly 189 frost-free days, Summerfield places 21,728 of 40,283 ZIP codes in this dataset. Within IL, it ranks 644 of 1,548.
Learn more
Two guides worth reading on 62289: local microclimates, on what one yard in Summerfield can differ from the 62289 normal, and zone vs. frost date, on why Zone 6b and Summerfield's frost date answer different questions.