Applications for the 2027 Chicago Marathon will open at 8 a.m. U.S. Central Time on Thursday, October 8. The heading for the notice reads 2027 Applications. The page points readers to more detail about the application process.
The site counts down to the next race day, October 11, 2026. A participant account area is listed in the page menu. The page also carries a cancellation section.
For a runner aiming at the 2027 Chicago Marathon, the application window opens at 8 a.m. U.S. Central Time on Thursday, October 8.