Dorney Lake Triathlon

RunThrough UK hosts the Dorney Lake Triathlon at Dorney Lake, Windsor, UK, on 8 August 2026. The event features Super Sprint (400m swim, 9.5km bike on 2 laps, 2.5km run), Sprint (750m swim, 19km bike on 4 laps, 5km run), and Standard (1500m swim, 38km bike on 8 laps, 10km run). Relay and Aquabike options are available.

Dorney Lake’s purpose-built, flat course is ideal for fast times, with distance markers and plenty of marshals. The day includes a lively event village, themed medals, free race photos, chip-timed results, post-race goodies, and sustainability initiatives. Set at a unique Olympic venue, the race offers a memorable atmosphere. Visit the organization's website for the most recent information.