Green Mountain Marathon

Green Mountain Marathon 2025 Course Analysis

Green Mountain Marathon is a full marathon held in South Hero, United States of America, scheduled for Sunday 19 October 2025. The course is run on road surface with 340m of total elevation gain, reaching a maximum altitude of 64m above sea level. For registration and full race details, visit the official Green Mountain Marathon website.

Elevation Profile

This is a hilly course with 340m of total elevation gain. The route climbs from 29m to as high as 64m above sea level — a substantial 35m elevation range. Runners should train on hills and plan for a more conservative pacing strategy, especially on the climbs.

Expected Race Day Weather

Based on historical weather data for October, the expected race day conditions are as follows. Moderate temperatures between 12°C and 21°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: Road

Green Mountain 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 Green Mountain Marathon?

Our difficulty rating for Green Mountain 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 Green Mountain Marathon against other marathons to find the right race for your goals.