Sunday, October 11, 2010 http://www.runtri.com/2009/01/Chicago-marathon-2009-registration-and.html
October 10, 2010. That's according to the Bank of America Chicago Marathon office as of this morning, 28 August 2009. The 2011 date is also on Columbus Day weekend, October 9, 2011.
October 9, 2011
October 14, 2012
Sunday, October 11, 2010 http://www.runtri.com/2009/01/chicago-marathon-2009-registration-and.html
Nov 1, 2009. usually first Sunday in November.
It is generally the day before Columbus Day, which in 2013 is the 14th so the marathon is probably 11/13
Chicago Marathon was created in 1977.
Runners in the Chicago Marathon complete 26.2 miles. This is the standard marathon distance. They Chicago Marathon also offers a half marathon option which is 13.1 miles.
Chicago Marathon happened on 2012-10-07.
Chicago Half Marathon was created in 1997.
Chicago Half Marathon happened on 2011-09-11.