Dirty December Trail Run

DEC

20

2026

Hit the trails in San Diego on December 20, 2026 for the Dirty December Trail Run, featuring marathon, half marathon, 10K and a new Hill Climb six hour challenge up and down Cardiac Hill. Wear a costume for solo or team awards and vie for King or Queen of the hill.

Sun 20 Dec 2026

San Diego, California

Website Registration

6 hour Marathon Half Marathon 10 kilometers

Always double-check with the organizer's website! This page may contain affiliate links.

Dirty December Trail Run - December 20, 2026

The event takes place in San Diego, CA on Sunday, December 20, 2026. It includes multiple race options and a costume contest with two award categories: solo costume and team costume. Registration closes on Friday, December 18 at 11:59 PM PT. The organizer lists a website and maps for directions.

Race formats and course details

Marathon
1/2 Marathon
10K
Hill Climb 6HR

The Hill Climb 6-hour race is described as a new event. It uses a 2.5-mile route that goes down and then back up Cardiac Hill. Participants can complete repeated 2.5-mile laps during the six-hour period; cumulative distances shown include 2.5, 5, 7.5, 10, 12.5, 15, 17.5, 20, 22.5, 25, 27.5, and 30 miles. Winners of the Hill Climb receive "King" and "Queen of the hill" awards. Visit the organization's website for the most recent information.