Dirty December Trail Run
San Diego, United States • 21 Dec 2025
Dirty December Trail Run : Dec 21, 2025, Sycamore Canyon (San Diego, CA)
The Dirty December Trail Run is scheduled for December 21, 2025 at Sycamore Canyon in San Diego, CA. The event offers multiple race formats on trail terrain, including:
- Marathon
- Half Marathon
- 10K
- Hill Climb (6-hour)
Course, awards and rules
Elevation gain is listed by distance: the 10K has approx 1,000 ft, the Half approx 2,300 ft, and the Marathon approx 3,500 ft. The Hill Climb is a timed 6-hour event held on a 2.5-mile loop (down then back up) around Cardiac Hill; competitors complete as many laps as they can. Awards include a long sleeve tech shirt for all entrants and a finisher award. Overall first male and female for each distance receive a free race entry next year. A special prize is awarded for best costume, with separate solo and team costume categories.
Race rules note several safety and conduct requirements: runners must carry their own supplies between aid stations and a minimum of 40 oz of water, may not accept outside aid except for medical emergencies, must check in at every aid station to be credited with an official finish, must follow the marked trail, and will be disqualified for littering. The course description warns of hazards such as rough terrain, rattlesnakes, sharp cliffs, and mountain lions. Visit the organization's website for the most recent information.