Chicago Marathon 2025 Sign Up. The 2025 chicago marathon is sunday, october 13. The bank of america chicago marathon is a world class running event returning to the streets of chicago on sunday, october 8, 2023.

What is the chicago marathon route? For the first time ever, the 2025 race expects to see 50,000 participants cross the finish line, topping the record set in 2023, which recorded more than 47,000.