Altra Kielder Marathon Weekend
The Altra Kielder Marathon Weekend is a multi-day running event held in early October 2026 at Kielder Forest Park in Northumberland. The marathon route follows an almost entirely off-road course around Kielder Water, northern Europe’s largest man-made lake. The weekend programme includes the following events:- Marathon around Kielder Water
- Half Marathon
- 10K
- Gravel Duathlon individual and team options
- Junior races for younger runners
Entry Fees (2026)
- Marathon: £45
- Half Marathon: £39
- 10K: £27.50
- Gravel Duathlon: £60 (individual) or £83 (team)
- Junior races: £8
