Lockport, IL 60491 Frost Dates
Lockport, IL: when does the frost end?
The last spring frost here typically falls around 04/20, about 235 days from today. Fall's first freeze usually shows up around 10/22, roughly 184 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 Lockport, not a forecast for this year.
Stretching the season past the first frost
With roughly 8 weeks until Lockport's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Lockport's last frost
04/20 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Lockport against the rest of the dataset
About 184 days separate Lockport's last and first frost, putting it 23,434 of 40,283 ZIP codes nationally. Within IL, it ranks 869 of 1,548.
Learn more
Before leaning on 60491's figures: the frost range explains how to read the range around Lockport's dates instead of trusting one, while local microclimates explains what one yard in Lockport can differ from the 60491 normal.