2026 Semper Fred 5K

Official Marine Corps Marathon Organization event page lists Semper Fred 5K on 05.16.2026 with 2026 registration; public individual-entry 5K held the day before the Marine Corps Historic Half. Importance evidence: organized by Marine Corps Marathon Organization, whose official marathon page describes MCM as the third largest marathon in the United States and one of the largest in the world; these are official public individual-entry races in the same organizer family/weekend calendar.