Vernon Hills, IL 60061 Frost Dates
Vernon Hills, IL: when does the frost end?
The last spring frost here typically falls around 04/29, about 244 days from today. Fall's first freeze usually shows up around 10/20, roughly 172 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 Vernon Hills, not a forecast for this year.
Stretching the season past the first frost
With roughly 8 weeks until Vernon Hills's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Vernon Hills's last frost
04/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/15 and only about 1 year in 10 sees frost after that.
Vernon Hills against the rest of the dataset
At roughly 172 frost-free days, Vernon Hills places 28,170 of 40,283 ZIP codes in this dataset. Within IL, it ranks 1,336 of 1,548.
Learn more
Before leaning on 60061's figures: zone vs. frost date explains why Zone 6a and Vernon Hills's frost date answer different questions, while the frost range explains how to read the range around Vernon Hills's dates instead of trusting one.