Mark your calendar for the Dirty December Trail Run on Dec 20, 2026, USA's 2026 running calendar wouldn't be complete without it, with the action centred in San Diego, California, USA. The course follows a hilly route through San Diego's Sycamore Canyon Preserve. No elevation value is provided for the marathon, but with a half marathon elevation of 2,300 feet, we expect an elevation in excess of 4,000 feet.
🏃 Why Run This Race
- Challenging hilly terrain that rewards strong, well-trained runners
- Well-organised aid stations and on-course support throughout
- Welcoming local running community in San Diego, California
- Finisher medal, race day swag and post-race celebration for every participant
🏁 Race Distances & Events
- 6-Hour Endurance Run
- Marathon (26.2 miles / 42.2 km)
- Half Marathon (13.1 miles / 21.1 km)
- 10K Trail Run
📅 Event Details
- Date: Dec 20, 2026
- Location: San Diego, California, USA
- Available distances: 6-Hour Endurance Run | Marathon (26.2 miles / 42.2 km) | Half Marathon (13.1 miles / 21.1 km) | 10K Trail Run
💡 Runner Tips
- Train with hill repeats and strength work in the weeks leading up to race day
- Pack cold-weather running gear and layered clothing for race morning
Whether you're chasing a personal best, ticking off your first marathon, or simply enjoying the running community, the Dirty December Trail Run delivers an unforgettable race day. Register early, entries for popular distances fill quickly. Secure your spot at one of USA's premier 2026 running events today.