Hunter S. Thompson Fear & Loathing
Midtown Terrace, United States • 7 Dec 2025
Event overview
The Hunter S. Thompson Fear & Loathing is an annual urban ultramarathon in San Francisco, CA, held as a single-loop course starting and finishing at Twin Peaks. The 2025 edition is listed as the 41st running since 1985. Distances offered are:
- 50 Miler
- 50K
Entry fee is none and there is no participant limit. The event is presented by local running groups and is described by the organizers as a "fat ass" format with no formal awards; aid stations are provided but not guaranteed.
Course and logistics
The course is mostly on city streets: about 99% street surface for the 50K and with approximately 20% trail-option availability on the 50-mile route. Total climb and descent are each listed as 3,600 feet. Elevations include a high point of 847 ft (Twin Peaks) and a low point of 10 ft (Marina Green); the start and finish are both listed at 766 ft (Twin Peaks). A cutoff for the 50-mile distance is given as 11 hours with an intermediate cutoff at mile 25. Aid stations are listed at several approximate mile locations along the route, and maps and turn sheets are provided by the organizers. The event is also listed as a qualifier for the Ohlone Wilderness 50K Trail Run. Course record times and years are provided by the organizers. Visit the organization's website for the most recent information.