City Park, stadium passages and a Sunday marathon
The marathon, half marathon, Urban 10 Miler and relay share the weekend but are different entries. The zoo passage advertised for the half marathon is not evidence that the full marathon follows the same route. Download the full-marathon map and distinguish its course from the final-ten-mile option and the five-person relay legs.
Plan an expo visit before Sunday. The organizer directs marathon runners to Friday or Saturday packet pickup at the Cigna Denver Colfax Marathon Expo and explicitly rules out race-day collection. Confirm the final expo hours and location when the 2027 instructions arrive; a Sunday-only arrival would not satisfy the stated collection arrangement.
This is a race at Denver’s elevation, so assess effort rather than assuming a sea-level target will transfer unchanged. Use the route profile to identify climbs, turns and the stadium section, and choose a realistic opening pace. The event’s scenic features are useful navigation landmarks, not reasons to accelerate through crowded sections.
The separate Double Marathon Challenge requires another marathon between January 1 and May 15, followed by Colfax on May 16. That is an optional award programme, not a recommendation to race another marathon immediately before Denver. Enter the ordinary marathon if that best fits your preparation and recovery. Check the current course support, wave and cutoff details independently of challenge eligibility. Keep the Sunday start instructions separate from the expo appointment.
Confirmed race date
Denver Colfax Marathon: May 16, 2027. Verified on October 14, 2026 against the official event information.
Last-known race profile
These details identify the race page; they do not establish the next edition's operations. The previous race date does not establish the next edition. Use the confirmed date above and recheck the final participant instructions before committing to a race-day schedule.