
Aspen, United States of America · Sunday 25 July 2027
The Aspen Valley Marathon, held on July 19, 2025, in Basalt, Colorado, is a scenic event that takes runners through the heart of the Rocky Mountains. The course starts at Wagner Park in Aspen and finishes at Lions Park in Basalt, featuring a downhill profile that drops 1,418 feet over the first 20 miles. This makes it a fast and popular choice for runners seeking to qualify for the Boston Marathon.
Adjusted Time
4:04:42
Time difference: +4.7 minutes compared to a flat, road, temperate course.
On our difficulty model, Aspen Valley Marathon plays about 11 minutes slower than an average road marathon for a 3:30 runner. It ranks #377 hardest of 1150 marathons we analyse, and #195 of 575 in United States of America. 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 Aspen Valley Marathon | Difference |
|---|---|---|
| 3:00:00 | 3:01:37 | +01:37 |
| 3:30:00 | 3:33:05 | +03:05 |
| 4:00:00 | 4:04:42 | +04:42 |
| 4:30:00 | 4:36:28 | +06:28 |
| 5:00:00 | 5:08:21 | +08:21 |
| 5:30:00 | 5:40:22 | +10:22 |
| 6:00:00 | 6:12:30 | +12:30 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
Aspen Valley Marathon is a full marathon held in Aspen, United States of America. It is scheduled for Sunday 25 July 2027. The course is run on road surface with 48m of total climbing and around 454m of descent (a net drop of roughly 406m), with its high point near 2420m above sea level. For registration and full race details, visit the official Aspen Valley Marathon website.
This is a net-downhill course: it descends roughly 406m more than it climbs (48m of ascent against about 454m of descent), dropping from a high point near 2420m toward 1985m above sea level. Point-to-point downhill courses like this are among the fastest available for a personal best or a Boston qualifier - just be aware that sustained descending fatigues the quads late in the race, so ease off early and do some downhill running in training.
Based on historical weather data for July, the expected race day conditions are as follows. Hot conditions are expected, with temperatures between 18°C and 31°C. Heat is one of the biggest performance factors in distance running - for every degree above 15°C, finish times can slow by roughly 1-2%. Extra hydration and a conservative start are strongly recommended. There is a moderate chance of rain (26%). Runners may want to prepare for wet conditions but shouldn't expect persistent rainfall.
Aspen Valley 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 Aspen Valley Marathon against other marathons to find the right race for your goals.
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