Triathlete’s 2025 Race Series Report Shows Strong Growth, Evolving Priorities

December 17, 2025

Ironman and Challenge may still anchor the mass participation landscape, but in 2025, they were far from the only players shaping what it felt like to pin on a number as an everyday triathlete. Participation surged across multiple race series, new formats brought new athletes into the sport, and organizers across the board began rethinking what race weekends should look and feel like. Supertri expanded its reach, scooping up races in major U.S. markets. The T100 Tour continued to build closed-road, big-city weekends for everyday athletes. XTERRA doubled down on its off-road community. XTRI quietly grew its extreme niche without softening a thing. triathlete