Chicago Marathon Street Closures, as Posted: All 41 Segments Close by 6 a.m. October 11 — and Reopening Rolls Mile by Mile, 10:30 a.m. to 6 p.m.

The marathon organizer's own street-closures page, transcribed whole for October 11, 2026: 41 course segments with 40 closing at 6:00 a.m. and reopening in a posted wave from 10:30 a.m. to 6:00 p.m., the Columbus finish stretch closed Thursday to Monday, Grant Park starting September 24, and the page's own caveats quoted with every table. Anticipated times, as posted - a schedule records intent, not events.








