Green River Marathon

Green River Marathon 2026 Course Analysis

Green River Marathon is a full marathon held in Kent, United States of America, scheduled for Saturday 6 June 2026. The course is run on road surface with 0m of total elevation gain, reaching a maximum altitude of 12m above sea level.

Elevation Profile

This is a very flat course with only 0m of total elevation gain across the full distance. The course ranges from 0m to 12m above sea level — a 12m elevation range that makes it one of the flatter races available. Runners targeting a personal best will appreciate the minimal climbing.

Surface Type: Road

Green River 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 River Marathon?

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