What this directory covers
This directory contains 25 current 100K Trail Ultra event listings verified from official event-organizer pages, covering 19 countries. 16 events have a published date; 9 listings are retained with a clear date-to-be-confirmed state rather than guessed or dropped.
Every event guide keeps the official source, verification date, available course or format signals, plan start dates, practical tools and the details you still need to confirm. Search the full list above by event or place. Important links are present in the page source even when the compact list is collapsed.
Choose the event before the plan
Compare date, travel, course or venue demands, entry status and the time you can train consistently. Then use the 100K Trail Ultra training hub to choose a realistic runway. A longer plan is useful when it creates gradual foundation work and recovery margin—not when it adds more hard sessions.
The Long-run carbohydrate research separates practical signals from study limits before you turn a benchmark or protocol into training.
What must still be checked
Global directories do not contain every race-week fact. Before entering or travelling, open the official event page and confirm eligibility, start schedule, venue, course maps, equipment, cutoffs, athlete briefing, transport and cancellation terms. Recheck close to race day because organiser details can change.
Training and safety boundary
The guides are educational planning resources. They do not diagnose injury, certify open-water or cycling safety, prescribe an individual medical or nutrition plan, or guarantee a finish. Use appropriate supervision and qualified support for material safety or health concerns.