Excalibur Marathon

Excalibur Marathon 2025 Course Analysis

Excalibur Marathon is a full marathon held in Bwlah Penbarras, United Kingdom, scheduled for Sunday 11 May 2025. The course is run on road surface with 1770m of total elevation gain, reaching a maximum altitude of 546m above sea level. For registration and full race details, visit the official Excalibur Marathon website.

Elevation Profile

This is a very challenging course with 1770m of total elevation gain — significantly more than the average road marathon. The route ranges from 68m to 546m above sea level (478m range). Hill training is essential, and runners should expect a significantly slower time compared to a flat course.

Expected Race Day Weather

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.

Surface Type: Road

Excalibur Marathon is run on road surfaces, which provide the fastest and most predictable conditions for marathon running. Road courses allow for consistent pacing and are typically the best choice for runners targeting a personal best time.

How Difficult Is Excalibur Marathon?

Our difficulty rating for Excalibur Marathon is calculated using a model that combines elevation gain, temperature impact, and surface type. Use the difficulty calculator above to enter your target finish time and see exactly how many minutes this course would add or subtract compared to a perfectly flat, cool, road-based marathon. Faster runners and slower runners are affected differently by the same course conditions, so the difficulty is personalised to your pace.

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.