Johnsonville, IL 62850 Frost Dates
62850, near Johnsonville, IL: the frost window
The last spring frost here typically falls around 04/09, about 224 days from today. Fall's first freeze usually shows up around 10/24, roughly 198 days after the last spring frost.
Johnsonville 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
Johnsonville'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 04/09 isn't a guarantee
04/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/23 and only about 1 year in 10 sees frost after that.
Johnsonville against the rest of the dataset
At roughly 198 frost-free days, Johnsonville places 18,565 of 40,283 ZIP codes in this dataset. Within IL, it ranks 312 of 1,548.
Learn more
Two guides worth reading on 62850: the frost range, on how to read the range around Johnsonville's dates instead of trusting one, and local microclimates, on what one yard in Johnsonville can differ from the 62850 normal.