Grand Island Trail Marathon

Grand Island Trail Marathon 2026 Course Analysis

Grand Island Trail Marathon is a full marathon held in Munising, United States of America, scheduled for Saturday 25 July 2026. The course is run on trail surface with 0m of total elevation gain, reaching a maximum altitude of 279m above sea level. For registration and full race details, visit the official Grand Island Trail Marathon website.

Elevation Profile

This is a very flat course with only 0m of total elevation gain across the full distance. The course ranges from 180m to 279m above sea level — a 99m 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 July, the expected race day conditions are as follows. Moderate temperatures between 15°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 (2%), so dry conditions are likely.

Surface Type: Trail

Grand Island 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 Grand Island Trail Marathon?

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