Chicago Marathon organizers, city officials to host 'welcome event' for runners

CHICAGO (WLS) -- The 42nd Annual Bank of America Chicago Marathon is happening Sunday.

More than 45,000 runners from over 100 countries will participate in the 26.2 mile iconic marathon across the city.

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Marathon organizers will join Chicago officials Thursday morning to host a welcome event for all participants.

The start and finish lines for the race are both in Grant Park on Columbus Drive

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No parking zones will begin at 1 a.m. on Sunday. Residents should pay attention to no parking signs in their areas for full details and timing.

Rolling street closures will take place between 7 a.m. - 3:30 p.m. Roads near Grant Park will be closed for longer periods of time.

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City streets will reopen as the final runners pass through at a 15-minute mile pace.

Marathon officials ask all residents not to attempt to block the race course at any point for the safety of the runners.