Thousands of runners will turn the Chicago streets green, for the return of the Bank of America Shamrock Shuffle.

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Nearly 20,000 runners are expected to take off in this popular race, to kick off the spring running season.

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The annual tradition is held a week after the Chicago River dyeing and continues with St. Patrick’s Day celebrations.

Runners come decked out in their green running attire.

There is a 2-mile walking course, and an 8K-mile course.

Walkers go along the lakefront and then runners go throughout downtown.

Wave one of the race starts at 8:30 a.m.

Street closures along the route will occur between 7:30 a.m. and 11:30 a.m. The roads in Grant Park are expected to be closed longer:

-Columbus Drive from Roosevelt Road to Grand Avenue

-Grand Avenue from Columbus Drive to State Street

-State Street from Grand Avenue to Wacker Drive

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-Wacker Drive from State Street to Washington Boulevard

-Washington Boulevard from Wacker Drive to State Street

-State Street from Washington Boulevard to Jackson Boulevard

-Jackson Boulevard from State Street to Franklin Street

-Franklin Street from Jackson Boulevard to Harrison Street

-Harrison Street from Franklin Street to Michigan Avenue

-Michigan Avenue from Harrison Street to Roosevelt Rd.

-Roosevelt Rd. from Michigan Avenue to Columbus Drive

Last year’s race brought 28,000 runners to the Chicago area.