Prepare for an epic journey through the stunning landscapes of Southern California at the San Diego 100, an iconic 100-mile endurance run taking place on May 1, 2026. Setting off from the picturesque Lake Cuyamaca Recreation Area, near the charming mountain community of Julian, this event challenges runners with a formidable course that is approximately 85-90% technical single-track trail, winding through the Mt. Laguna Recreational Area, Rancho Cuyamaca and Anza Borrego State Parks, Noble Canyon, and segments of the legendary Pacific Crest Trail. With over 15,000 feet of elevation gain and descent, starting at around 4,600 feet and reaching elevations of up to 7,000 feet, runners will encounter a diverse and demanding terrain, from exposed ridges offering expansive desert vistas to shaded forest sections.

The San Diego 100 is celebrated for its challenging nature, exceptional organization, and vibrant community spirit, earning its reputation as a qualifying race for the prestigious Western States 100. Participants will find support at 16 well-stocked aid stations, with drop bag access at eight of them, offering a wide array of fuel from electrolyte drinks and gels to hot soups at night, ensuring runners are well-equipped throughout the 32-hour time limit. Typical race day conditions in early May often see highs around 67°F and lows around 56°F with a minimal 2% chance of precipitation, though runners should be prepared for potential temperature swings from near-freezing wind chills at night to hot, exposed conditions during the day.

This 25th annual event distinguishes itself with unique offerings designed for its dedicated ultrarunning community. Solo division runners, who tackle the course relying solely on aid stations and drop bags, receive special recognition and a discount. Additionally, runners over 60 are granted an hour early start, and the race proudly offers Scotty Mills Scholarships for those who exemplify community service, alongside a 10% discount for active military and first responders. With a strong focus on trail preservation, the San Diego 100 is a cupless event and requires a volunteer commitment or donation in lieu of service, fostering a deep connection to the trails it traverses. Reviews consistently praise the impeccably marked course and the supportive volunteer staff, making the San Diego 100 a truly unforgettable and challenging experience for any ultrarunner.