Cadair X Half Marathon

Cadair X Half Marathon 2026 Course Analysis

Cadair X Half Marathon is a half marathon held in Gwynedd, United Kingdom. It is scheduled for Saturday 17 October 2026. The course is run on trail surface with 1107m of total climbing, with its high point near 886m above sea level. For registration and full race details, visit the official Cadair X Half Marathon website.

Elevation Profile

This is a very challenging course with 1107m of total climbing - well above the average trail marathon - topping out around 886m above sea level. Hill training is essential, and you should expect a slower finish time than on a flat course.

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 6°C to 17°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: Trail

Cadair X Half 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 Cadair X Half Marathon against other half marathons to find the right race for your goals.