Dirty December Trail Run
San Diego, United States • 21 Dec 2025
Event
The Dirty December Trail Run is a holiday trail event held on December 21, 2025, at Sycamore Canyon Parking near San Diego, California. Distances offered include:
- Marathon
- Half Marathon
- 10K
- Hill Climb 6HR (repeated 2.5 mile loop up and down Cardiac Hill)
The Hill Climb 6HR is a new format that counts how many 2.5 mile laps a competitor completes. Winners of the hill event receive King and Queen of the Hill awards. Costume awards are given in solo and team categories.
Race details and rules
All entrants receive a long sleeve technical shirt; finishers receive a finisher award. First male and female overall in each distance receive a free race entry for the following year. A special prize is awarded for best costume.
Aid and safety rules include a requirement that runners carry a minimum of 40 oz of water and carry their own supplies between aid stations. Except for medical emergencies, no outside aid or pacers are allowed between aid stations. Runners must be checked in at every aid station; entrants who withdraw must turn in their race bib. Littering results in disqualification. The course contains natural hazards such as mountain lions, rough terrain, rattlesnakes, sharp cliffs, and drop-offs. Use of headphones is not recommended. Visit the organization's website for the most recent information.