The Northumbrian
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The Northumbrian
The Northumbrian is a multi-discipline endurance event at Kielder Water and Forest on 28 June 2026. The programme includes full and half Iron distance triathlons alongside UTMB index ultra trail runs. The 2026 edition marks the fifth anniversary of the full and half Iron distance triathlons. The event will host the 2026 British and English Middle Distance Triathlon Championships for the Half Iron distance; all Half Iron entries are automatically entered into those championships.
The route uses the lake, forest trails and surrounding valley, with the bike course crossing into the Border region.
Distances:
- Full Iron Distance Triathlon: Swim 2.4 miles Bike 112 miles Run 26.2 miles
- Half Iron Distance Triathlon: Swim 1.2 miles Bike 56 miles Run 13.1 miles
- 50K Ultra Trail Run: 48 km with +700 m elevation
- 20K Trail Run: 27 km with +400 m elevation
Entry fees include a Northumbrian cycling jersey or running t shirt for individual entries, a swim cap for triathlon entries, electronic chip timing, on course support and nutrition, a medal and finisher's goody bag, and parking. A team relay option is available for the full or half triathlon as a team of three. Visit the organization's website for the most recent information.
