Kielder Half Marathon & Marathon

The Altra Kielder Marathon is an unforgettable endurance challenge set in the heart of Northumberland’s stunning wilderness. Taking place in 2025, the course follows a full circuit around Kielder Water, leading runners through dense forests, rugged trails, and remote lakeside paths. With undulating hills, mixed terrain, and breathtaking views, it’s a test of strength, strategy, and resilience. Fully supported with chip timing, frequent aid stations, and medical teams, the event ensures a seamless race-day experience. Each finisher is rewarded with a bespoke medal and a vibrant event village awaits at the finish line, creating a festival-like atmosphere.