XTERRA
XTERRA Trail Run World Series
Nationwide and international. XTERRA O-SEE Ultra Trail is part of the global XTERRA Trail Run World Series – as the only event in Germany. In 2026, XTERRA O-SEE Ultra Trail will also host the XTERRA European Trail Run Championship, contested exclusively over the 25 km and 50 km distances. These championship races will award the top finishers in all age-group categories and offer qualification slots to the 2027 XTERRA Trail Run World Championship, adding an extra layer of meaning and opportunity to every step of the course.
Compete individually, regionally or globally in the XTERRA Trail Run rankings, or push to the front of the pack in your age group to qualify for a place on the starting line at the annual and invite-only XTERRA Trail Run World Championship.
See the XTERRA Trail Run World Series page for information regarding the rankings, qualification rules and criteria.
Distances & categories
The XTERRA O-SEE Ultra Trail includes both half-marathon (O-SEE 25k) and full-marathon (O-SEE 50k) races, with individual and team DUO categories available.
Divisions for men and women: 19U, 20-24, 25-29, 30-34, 35-39, 40-44, 45-49, 50-54, 55-59, 60-64, 65-69, 70-74, 75-79, 80+, and Physically Challenged.