The Northumbrian
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Event overview
The Northumbrian is a multi-discipline endurance event held at Kielder Waterside in Kielder Forest, Northumberland. The 2026 edition is the fifth running of the full and half iron-distance triathlons and includes UTMB index ultra trail runs. The event is open to a limited number of individual and team entries. The half iron-distance race will also serve as the 2026 British and English Middle Distance Triathlon Championships; all half-distance entries are automatically entered into those championships. Triathlon entrants must hold a British Triathlon membership or a single-use race pass and a race licence. Age restrictions apply for some events.
Race formats and what is included
Distances (by event):
- Full Iron: 2.4 miles swim, 112 miles bike, 26.2 miles run
- Half Iron: 1.2 miles swim, 56 miles bike, 13.1 miles run
- 50K Ultra Trail: 48 km run, +700 m elevation
- 20K Trail: 27 km run, +400 m elevation
Individual entry fees include a Northumbrian cycling jersey or running t-shirt (individual entries only), swim cap for triathlon entries, electronic chip timing, on-course support and nutrition, a medal and finisher’s goody bag, and parking. Trail runs and some entries have minimum age limits. Visit the organization's website for the most recent information.
