Tri-Cities Marathon October 25, 2026 By Sean Tri-Cities Marathon Website Current Events Upcoming Events Past Events There are currently no events. There are currently no events. 25 Oct 25 Oct - 25 Oct Tri-Cities Marathon 10-25-26 @ 08:00 AM - 10-25-26 @ 02:00 PM Riverfront Hotel, Richland, WA 99352, US Road Paid