When Is The Chicago Marathon 2025 Date. To create consistency and predictability for community members impacted by the bank of america chicago marathon, the chicago marathon takes place on the second sunday of october. The bank of america chicago marathon will take place on sunday, october 12th, 2025 and is one of the year's greatest running events.

2025 bank of america chicago marathon. It’s part of the six world marathon majors, attracting over 40,000 runners every year.