Active Northumberland Kielder Marathon
Circumnavigate the largest man-made lake in northern Europe, Kielder Water, on an off-road marathon which is one of the most stunning marathon races around!
- Sun 5 Oct 2025
Marathon
10:15
Age 18 & over
£39-£41
- 26.2 miles trail running
Event overview
A full weekend of running and cycling celebrating everything that's amazing about Kielder Water, northern Europe's largest man-made lake.
Surrounded by lush pine forest and with hard-packed trails weaving around its perimeter, the water is the perfect location for these popular races.

2,500 runners and duathletes will descend on Northumberland to test themselves over off-road courses, including the headline marathon, half marathon, 10K, standard-distance duathlon and two junior races.
With breathtaking views and professionally organised events, the Kielder Marathon Weekend is definitely one for your calendar!
Highlights
wild location
Kielder Water is a spectacular backdrop for these races, set amidst verdant pine forests.
stunning course
Mostly off-road, the routes cover hard-packed trails with some undulating terrain.
sell-out event
The weekend is growing in popularity and regularly attracts thousands of athletes and spectators.
family-friendly weekend
With two separate junior races, there's something for everyone at Kielder!
This event is part of Kielder Marathon Weekend.
Event details
- All fitness levels
- Event village
- Free venue entry
- Spectators
- Traders at event
Location
- Bag storage
- Bar
- Cafe
- Camping
- Free parking
- Music
- Restaurant
- Rural
- Toilets
Route
- 1 lap
- Distance markers
- First aid
- Marshals
- Mass start
- Toilets
- Traffic free
- Undulating
- Water stations
- Way markers
What's included
- Goody bag
- Massage
- Medal
- Technical t-shirt
Entries
- Age 18 & over
- Entries open
- Enter online
- Race pack by post
Other races at event
- Sat 4 Oct
- #1 of 6
Gravel Duathlon
13:00
Age 17 & over
£55-£75
- 10 km trail running
- 34 km mountain biking
- 6.4 km trail running
- Sat 4 Oct
- #2 of 6
10K
13:00
Age 15 & over
£23.50-£25.50
- 10 km trail running
- Sun 5 Oct
- #4 of 6
Half Marathon
10:15
Age 17 & over
£34-£36
- 13.1 miles trail running
- Sun 5 Oct
- #5 of 6
Junior | The Ospreys
10:45
Age 6-10
£8
- 1.5 km trail running
- Sun 5 Oct
- #6 of 6
Junior | The Falcons
10:45
Age 11-15
£8
- 2.5 km trail running