Buenos Aires International Marathon
Buenos Aires, Argentina · Sunday 21 September 2025
Running through Buenos Aires in September means you'll start your race in the early morning cool along Avenida Figueroa Alcorta, where the city is just waking up. The course stays mercifully flat with only gentle rolls, which sounds forgiving on paper but feels different when you hit kilometer eighteen and realize you've been cruising through neighborhoods where the pavement changes texture beneath your feet and the humidity starts climbing. You'll notice the light bouncing off the Rio de la Plata in the distance, and if you're paying attention between miles, you'll see why this race has the reputation for speed that it does. The elevation barely registers, which means there's nowhere to hide and no excuses for slowing down. Your legs will feel the relentless flatness more than any real hill ever could. The later miles take you through residential streets where locals line the course with energy and mate passed between friends, and you'll catch the mix of older European-influenced architecture alongside more modern developments that make Buenos Aires feel less like a mountain town and more like a sprawling urban marathon. By kilometer thirty, the morning cool has burned off and you're running into afternoon heat, which is when the actual character of the course reveals itself. The terrain itself won't defeat you, but the combination of flat running with rising temperature and the sheer distance will demand respect. This isn't a course that gives you drama or big descents to recover on. It's pure, honest running through a real city where speed is earned rather than gifted.
Difficulty Calculator
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Adjusted Time
4:34:07
Time difference: +34.1 minutes compared to a flat, road, temperate course.
Course Details
Elevation Gain108m
Elevation High45m
Elevation Low5m
Buenos Aires International Marathon 2025 Course Analysis
Buenos Aires International Marathon is a full marathon held in Buenos Aires, Argentina, scheduled for Sunday 21 September 2025. The course is run on trail surface with 108m of total elevation gain, reaching a maximum altitude of 45m above sea level. For registration and full race details, visit the official Buenos Aires International Marathon website.
Elevation Profile
With 108m of elevation gain, this is a moderately undulating course. The route ranges from 5m to 45m above sea level (40m total range). While not completely flat, the elevation changes are manageable for most runners and shouldn't significantly impact pacing strategy.
Surface Type: Trail
Buenos Aires International 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 Buenos Aires International Marathon?
Our difficulty rating for Buenos Aires International 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 Buenos Aires International Marathon against other marathons to find the right race for your goals.