Free timed 5K and 1-mile community run at Big Marsh, a partnership of the Chicago Area Runners Association and the Park District. Runners, joggers and walkers welcome.
Go Run at Big Marsh is a free, timed 5K and 1-mile run on Saturday, October 31, from 9 to 11 AM. It's a partnership between the Chicago Area Runners Association and the Park District, aimed at bringing neighbors together through running and volunteering. Runners, joggers and walkers of all levels are welcome, and it's listed for all ages. You must register in advance at GoRunChicago.org. Registration opens at 3 PM on the Friday the week before, so sign up early. This is a regular community run, not a Halloween-themed race.
Timed 5K and 1-mile. Registration opens Friday 3 PM the week before and closes Friday 2 PM the day before (per CARA).
Details checked against the official organizer on Oct 5, 2026. Times and prices can change, so confirm with the organizer before you go.