The Northumbrian
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Event overview
The Northumbrian is an endurance triathlon event held at Kielder Water and Forest Park in Northumberland National Park. The event in 2026 is the fifth edition and includes the British and English Middle Distance Triathlon Championships. The 2025 edition had over 400 athletes and the event series is run by Events of the North. Racecheck ratings show an overall score of 4.71 from 118 reviews.
Races and entry
- Full Iron Distance Tri
- Half Iron Distance Tri
- Aquabike Half Distance - actual 48 km
- 50K Ultra Trail Run
- 28K Trail Run
- Team Full and Team Half distance options
Triathlon entries require British Triathlon membership and a race licence or a single-use Race Pass. Age restrictions apply - triathlon and team entries require entrants to be 18 or older; trail runs require specific minimum birth years. Entry fees listed for 2026 include £330 (Full), £215 (Half), £165 (Aquabike), £230 (Team Half), £350 (Team Full), £65 (50K), and £40 (28K); these prices were shown as valid until late June 2026.
Course and race characteristics
Swims take place in Kielder Water (lake). Reviews and course data describe the bike route as hilly and the run as undulating with forest sections. The event provides multiple race formats, on-site merchandise, and race village services. Visit the organization's website for the most recent information.
