Hunter S. Thompson Fear & Loathing

The Hunter S. Thompson Fear & Loathing event is a renowned ultra-running race held annually in San Francisco, CA, celebrating its 41st edition in December 2025. Participants can choose between a 50K and a 50-mile course, with no entry fee required.

The race features a mix of city streets and parallel trail options, with a total elevation gain and descent of 3,600 feet. Aid stations are provided along the routes, ensuring runners have support throughout the challenging course. The event has a rich history, showcasing impressive completion rates and course records, making it a significant occasion for the ultra-running community. Visit the organization's website for the most recent information.