13.1™ is the Inaugural series of themed half marathons serving some of America's top running communities with a stand-alone half marathon for locals to embrace and visitors to experience.

Where the Party meets the Pavement!

Currently, events take place in Chicago (June 7, 2009), Atlanta (October 4, 2009),
Fort Lauderdale (November 15, 2009)  and Miami Beach (March 7, 2010).

This series is brought to you by the producers of the ING Miami Marathon and Half Marathon, the ING Georgia Marathon and Half Marathon, and the Chicago Half Marathon.