Kielder Marathon
Kielder, United Kingdom · Tuesday 5 October 2027
Kielder Marathon, known as Britain's Most Beautiful Marathon, is held around Kielder Water in Northumberland. The event takes place over a weekend and features a variety of races, including a full marathon, half marathon, 10K, and junior fun runs. The marathon route follows an almost entirely off-road course around the lake, offering breathtaking scenery and an electric atmosphere.
Difficulty Calculator
h
:m
:s
Adjusted Time
4:50:41
Time difference: +50.7 minutes compared to a flat, road, temperate course.
Course Details
Elevation Gain472m
Elevation High240m
Elevation Low189m
Weather Forecast
High12°C
Low8°C
Chance of Rain55%
How hard is Kielder Marathon?
Very Difficultharder than 94% of marathons
Flattest / easiestHardest
On our difficulty model, Kielder Marathon plays about 49 minutes slower than an average road marathon for a 3:30 runner. It ranks #67 hardest of 1151 marathons we analyse, and #10 of 57 in United Kingdom. Use the calculator above to see the exact adjusted time for your own goal pace.
What will you run at Kielder Marathon?
Estimated finish times on this course versus the same effort on an average road marathon, based on its elevation, surface, and expected race-day temperature.
| Average-course time | On Kielder Marathon | Difference |
|---|---|---|
| 3:00:00 | 3:36:33 | +36:33 |
| 3:30:00 | 4:13:33 | +43:33 |
| 4:00:00 | 4:50:41 | +50:41 |
| 4:30:00 | 5:28:00 | +58:00 |
| 5:00:00 | 6:05:31 | +1:05:31 |
| 5:30:00 | 6:43:16 | +1:13:16 |
| 6:00:00 | 7:21:14 | +1:21:14 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
Kielder Marathon 2027 Course Analysis
Kielder Marathon is a full marathon held in Kielder, United Kingdom. It is scheduled for Tuesday 5 October 2027. The course is run on trail surface with 472m of total climbing, with its high point near 240m above sea level. For registration and full race details, visit the official Kielder Marathon website.
Elevation Profile
This is a hilly course with 472m of total climbing, rising to around 240m above sea level. It pays to train on hills and to pace the climbs conservatively.
Expected Race Day Weather
Based on historical weather data for October, the expected race day conditions are as follows. Near-ideal running temperatures are expected, ranging from 8°C to 12°C. This temperature range is widely considered optimal for marathon performance, allowing efficient heat dissipation without cold-related issues. There is a high chance of rain (55%). Runners should prepare for wet conditions, including appropriate footwear and clothing choices.
Surface Type: Trail
Kielder Marathon is a trail race, meaning the course includes unpaved surfaces such as dirt, gravel, or forest paths. Trail surfaces are usually slower than the road equivalent - often by 10-20% - because of uneven footing, technical sections, and frequently steeper gradients, though a smooth, non-technical or downhill trail can run faster than that suggests. Trail-specific shoes with good grip are recommended.
Looking for an easier marathon or a tougher challenge? You can also compare Kielder Marathon against other marathons to find the right race for your goals.
Marathons of similar difficulty
If Kielder Marathon fits your goal, these courses play out about the same on our difficulty model.
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