Bwlah Penbarras, United Kingdom · Tuesday 11 May 2027
The Excalibur Marathon, held on May 11, 2025, in Denbighshire, UK, is a challenging trail event that offers breathtaking views of the Welsh countryside. The course features over 5,500 feet of ascent, making it a grueling yet rewarding experience for trail running enthusiasts. Participants can choose from a variety of distances, including a 10K, half marathon, and full marathon, making it accessible to runners of all levels.
Adjusted Time
5:24:27
Time difference: +84.4 minutes compared to a flat, road, temperate course.
On our difficulty model, Excalibur Marathon plays about 68 minutes slower than an average road marathon for a 3:30 runner. It ranks #31 hardest of 1151 marathons we analyse, and #8 of 57 in United Kingdom. Use the calculator above to see the exact adjusted time for your own goal pace.
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 Excalibur Marathon | Difference |
|---|---|---|
| 3:00:00 | 3:43:12 | +43:12 |
| 3:30:00 | 4:32:42 | +1:02:42 |
| 4:00:00 | 5:24:27 | +1:24:27 |
| 4:30:00 | 6:18:16 | +1:48:16 |
| 5:00:00 | 7:14:01 | +2:14:01 |
| 5:30:00 | 8:11:35 | +2:41:35 |
| 6:00:00 | 9:10:53 | +3:10:53 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
Excalibur Marathon is a full marathon held in Bwlah Penbarras, United Kingdom. It is scheduled for Tuesday 11 May 2027. The course is run on road surface with 1770m of total climbing, with its high point near 546m above sea level. For registration and full race details, visit the official Excalibur Marathon website.
This is a very challenging course with 1770m of total climbing - well above the average road marathon - topping out around 546m above sea level. Hill training is essential, and you should expect a slower finish time than on a flat course.
Based on historical weather data for May, the expected race day conditions are as follows. Near-ideal running temperatures are expected, ranging from 9°C to 20°C. This temperature range is widely considered optimal for marathon performance, allowing efficient heat dissipation without cold-related issues. There is a low chance of rain (0%), so dry conditions are likely.
Excalibur Marathon is run on road surfaces, which provide the fastest and most predictable conditions for racing. Road courses allow for consistent pacing and are typically the best choice for a personal best.
Looking for an easier marathon or a tougher challenge? You can also compare Excalibur Marathon against other marathons to find the right race for your goals.
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