Kielder Marathon takes place on Sun, Oct 3, 2027 in Kielder, United Kingdom. The main route is 42.2 km.
- Date
- Sun, Oct 3, 2027
- Start
- Kielder 🇬🇧
- Distance
- 42.2 km
- Level
- Open to all
Your 50-week plan to Kielder Marathon
The Base phase starts this week. Built around your fitness and adjusted every day as your form changes; attach the course and it prepares for the climbs too.
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A trail marathon almost entirely off-road around Kielder Water in Northumberland, with a half marathon, 10K and gravel duathlon held the day before.
Your road to race day
Race day at Kielder Marathon is 50 weeks away. This is how a coach divides that time. The first phase starts now.
01Base38 weeks · Oct 19, 2026 – Jul 11, 2027
Aerobic foundation: mostly steady endurance work that grows the aerobic engine and the durability the later phases stand on.
02Build6 weeks · Jul 12, 2027 – Aug 22, 2027
Progressive overload: training load climbs in waves, with harder weeks stacked on the base and planned recovery weeks that let the gains land.
03Peak3 weeks · Aug 23, 2027 – Sep 12, 2027
The hardest weeks of the plan: race-specific intensity at nearly full training load, sharpening exactly what this race asks for.
04Taper2 weeks · Sep 13, 2027 – Sep 26, 2027
Volume drops while intensity stays: short, sharp efforts keep the legs awake as fatigue drains away.
05Race week1 week · Sep 27, 2027 – Oct 3, 2027
Openers, rest and logistics. The work is done; the job now is arriving fresh.
Frequently asked questions
When is Kielder Marathon?
Kielder Marathon takes place on Sun, Oct 3, 2027 in Kielder, United Kingdom.
How long is Kielder Marathon?
The main route is 42.2 km.
Who is Kielder Marathon for?
Kielder Marathon is open to all participants.
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