
Puerto Natales, Chile · Wednesday 9 September 2026
This race suits experienced trail runners who are comfortable with sustained climbing and technical terrain. You need solid leg strength and the mental fortitude to keep pushing through a hilly course, especially in the latter stages when fatigue compounds the gradient. Trail running experience matters here because while the elevation gain of nearly 1000 metres isn't extreme for a full marathon, the concentration required to move safely over uneven ground adds another layer of difficulty beyond what road runners might expect. It's also a good test for runners who enjoy racing in remote, less-manicured environments and who don't mind some uncertainty about exact conditions. The Patagonian setting means weather can be unpredictable, so adaptability is part of the challenge. On the course itself, expect significant rolling climbs and descents throughout the 42 kilometres rather than one or two big efforts. The terrain rises and falls between roughly 25 metres and 350 metres above sea level, which means constant micro-adjustments to your pace and effort. Trail conditions in September, early spring in the Southern Hemisphere, could be muddy, rocky, or firm depending on recent weather. The major challenge isn't necessarily any single brutal climb but the accumulated toll of miles on technical ground, where your quads take a beating on the downs and your cardiovascular system stays elevated on the ups. The remote location means limited aid opportunities compared to road marathons, so self-sufficiency and careful pacing become critical. If you're expecting a fast time, this isn't the race for it. What it offers instead is a proper mountain marathon experience in one of the world's most dramatic landscapes.
Adjusted Time
4:44:08
Time difference: +44.1 minutes compared to a flat, road, temperate course.
On our difficulty model, Patagonian International Marathon plays about 37 minutes slower than an average road marathon for a 3:30 runner. It ranks #124 hardest of 1150 marathons we analyse, and #2 of 3 in Chile. Use the calculator above to see the exact adjusted time for your own goal pace.
Estimated finish times on this course versus the same effort on an average road marathon, based on its elevation, surface, and expected race-day temperature.
| Average-course time | On Patagonian International Marathon | Difference |
|---|---|---|
| 3:00:00 | 3:21:43 | +21:43 |
| 3:30:00 | 4:02:20 | +32:20 |
| 4:00:00 | 4:44:08 | +44:08 |
| 4:30:00 | 5:27:04 | +57:04 |
| 5:00:00 | 6:11:02 | +1:11:02 |
| 5:30:00 | 6:55:59 | +1:25:59 |
| 6:00:00 | 7:41:51 | +1:41:51 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
Patagonian International Marathon is a full marathon held in Puerto Natales, Chile. It is scheduled for Wednesday 9 September 2026. The course is run on road surface with 990m of total climbing, with its high point near 352m above sea level. For registration and full race details, visit the official Patagonian International Marathon website.
This is a very challenging course with 990m of total climbing - well above the average road marathon - topping out around 352m above sea level. Hill training is essential, and you should expect a slower finish time than on a flat course.
Patagonian International Marathon is run on road surfaces, which provide the fastest and most predictable conditions for racing. Road courses allow for consistent pacing and are typically the best choice for a personal best.
Looking for an easier marathon or a tougher challenge? You can also compare Patagonian International Marathon against other marathons to find the right race for your goals.
If Patagonian International Marathon fits your goal, these courses play out about the same on our difficulty model.