Greenbrier River Trail Marathon

Greenbrier River Trail Marathon 2026 Course Analysis

Greenbrier River Trail Marathon is a full marathon held in Lewisburg, United States of America, scheduled for Sunday 4 October 2026. The course is run on trail surface with 8m of total elevation gain, reaching a maximum altitude of 757m above sea level. For registration and full race details, visit the official Greenbrier River Trail Marathon website.

Elevation Profile

This is a very flat course with only 8m of total elevation gain across the full distance. The course ranges from 648m to 757m above sea level — a 109m elevation range that makes it one of the flatter races available. Runners targeting a personal best will appreciate the minimal climbing.

Expected Race Day Weather

Based on historical weather data for October, the expected race day conditions are as follows. Moderate temperatures between 9°C and 26°C are expected. While comfortable for most runners, those targeting fast times should pay attention to hydration, as these temperatures can impact performance over the full distance. There is a low chance of rain (0%), so dry conditions are likely.

Surface Type: Trail

Greenbrier River Trail Marathon is a trail race, meaning the course includes unpaved surfaces such as dirt, gravel, or forest paths. Trail surfaces are inherently slower than road courses due to uneven footing, technical sections, and often steeper gradients. Trail-specific shoes with good grip are recommended, and runners should expect a finish time 10-20% slower than their equivalent road marathon time.

How Difficult Is Greenbrier River Trail Marathon?

Our difficulty rating for Greenbrier River Trail 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 Greenbrier River Trail Marathon against other marathons to find the right race for your goals.