CHICAGO - The Chicago Marathon steps off on Sunday when thousands of runners will traverse 26.2 miles throughout the city.

The first wave of competitors will start as early as 7:20 a.m., which means major street closures along the course.

Here is what you need to know if you’ll be in the city on Sunday.

Race schedule

Then on the marathon race day on Sunday, Grant Park will open to participants starting at 5:30 a.m.

Race start times:

Men’s professional wheelchair race start: 7:20 a.m.

Women’s professional wheelchair race start: 7:21 a.m.

Handcycle start: 7:23 a.m.

Men’s and women’s professional start: 7:30 a.m.

High performance program start: 7:32 a.m.

Wave 1 start: 7:35 a.m.

Wave 2 start: 8 a.m.

Wave 3 start: 8:35 a.m.

Grant Park opens to spectators at 9:30 a.m.

Street clo

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