The Northumbrian
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Event overview
The Northumbrian is a multi-discipline endurance event held at Kielder Water and Forest Park, based at Kielder Waterside in Northumberland. The 2026 edition is scheduled for 28 June 2026 and is the fifth running of the event. The programme includes full and half iron distance triathlons and UTMB index ultra trail runs. The event will host the 2026 British and English Middle Distance Triathlon Championships; all Half Iron Distance entries are automatically entered into those championships.
Race formats and services
Distances offered:
- Full Triathlon: Swim 2.4 miles, Bike 112 miles, Run 26.2 miles
- Half Triathlon: Swim 1.2 miles, Bike 56 miles, Run 13.1 miles
- 50K Ultra Trail Run: 48 km, +700 m elevation
- 20K Trail Run: 27 km, +400 m elevation
- Team relay options are available for full and half distances.
Cut-off and timing details provided by the organiser include swim, bike and run cut-off windows for the full distance and a single cut-off for the half distance (9 hours). The ultra trail runs use checkpoint cut-offs expressed in hours. Entry packages for individual participants include a cycling jersey or running t-shirt, swim cap for triathlon entries, electronic chip timing, on-course support and nutrition, a medal and finisher’s goody bag, and parking. The event is described as using forest and valley roads and trails around Kielder. Visit the organization's website for the most recent information.
