Johnston City, IL 62951 Frost Dates
Johnston City, IL: when does the frost end?
Around 04/09 is the usual last spring frost, about 224 days away. Fall's first freeze usually shows up around 10/22, roughly 195 days after the last spring frost.
Johnston City 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
With roughly 8 weeks until Johnston City's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Johnston City's last frost
04/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/25 and only about 1 year in 10 sees frost after that.
Johnston City against the rest of the dataset
At roughly 195 frost-free days, Johnston City places 19,277 of 40,283 ZIP codes in this dataset. Within IL, it ranks 339 of 1,548.
Learn more
Before leaning on 62951's figures: zone vs. frost date explains why Zone 7a and Johnston City's frost date answer different questions, while the frost range explains how to read the range around Johnston City's dates instead of trusting one.