Dirty December Trail Run

The Dirty December Trail Run returns to San Diego, California on December 20th, offering a unique blend of holiday cheer and endurance challenges for runners from across the United States. The event takes place at the scenic Mission Trails Regional Park, known for its challenging terrain and picturesque trails that wind through rugged hillsides and dense forests.
On race morning, participants will find themselves amidst crisp winter air as they prepare to tackle the park’s notorious Cardiac Hill or choose between a relaxed 10K run along well-marked paths. The setting is both serene and invigorating; runners can expect clear skies with minimal humidity thanks to San Diego's typically mild December climate. Trail conditions are firm yet slightly soft, ideal for maintaining speed while navigating the natural terrain.
This event has become an annual tradition in San Diego since its inception five years ago, drawing over 500 participants each year who come together not just to compete but also to celebrate the holiday season with a fun twist: costume contests and awards. The race supports local youth education initiatives by raising funds for scholarships and community programs that benefit young athletes looking to pursue their running dreams.
The Dirty December Trail Run features a variety of challenging distances, including the 1/2 Marathon (21.1K) and full Marathon (42.2K), both of which traverse some of San Diego’s most scenic trails in Mission Trails Regional Park. For those seeking an even greater challenge, there is also the Hill Climb 6HR event where runners can attempt to see how many times they can ascend Cardiac Hill within a six-hour window.
Runners interested in participating should visit https://ultrasignup.com/register.aspx?did=133806 for registration details. Fees range from $70 for the 10K run up to $115 for both the half marathon and the challenging hill climb event. Registration closes on December 9th, so early sign-up is recommended.
Bib pickup will take place at Mission Trails Regional Park Visitor Center located within the park itself one week before race day from 4pm-7pm where participants can collect their bib numbers and any additional information needed for race day. Participants should bring a photo ID to confirm registration details during this process.
The start location is clearly marked near the visitor center in Mission Trails Regional Park, accessible via car or public transportation with ample parking available onsite. The event welcomes runners of all ages but requires participants under 18 years old to have parental consent forms filled out and signed upon arrival at bib pickup. First-timers should ensure they arrive early on race day to familiarize themselves with the course layout and any special rules pertaining to each distance category.
The Dirty December Trail Run in San Diego, California on December 20th is an event that offers more than just a run; it's about celebrating local traditions while supporting youth education initiatives through competitive racing. Whether you're chasing personal records or participating for fun with friends and family dressed up as holiday characters, this race presents opportunities to engage deeply with the community and its natural beauty.