Denver Colfax Marathon

Denver Colfax Marathon 2025 Course Analysis

Denver Colfax Marathon is a full marathon held in Denver, United States of America, scheduled for Sunday 18 May 2025. The course is run on road surface with 217m of total elevation gain, reaching a maximum altitude of 1685m above sea level. For registration and full race details, visit the official Denver Colfax Marathon website.

Elevation Profile

With 217m of elevation gain, this is a moderately undulating course. The route ranges from 1577m to 1685m above sea level (108m total range). While not completely flat, the elevation changes are manageable for most runners and shouldn't significantly impact pacing strategy.

Expected Race Day Weather

Based on historical weather data for May, the expected race day conditions are as follows. Moderate temperatures between 7°C and 23°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 high chance of rain (55%). Runners should prepare for wet conditions, including appropriate footwear and clothing choices.

Surface Type: Road

Denver Colfax 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 Denver Colfax Marathon?

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