Dirty December Trail Run

DEC

20

2026

Trail running event in San Diego on Dec 20, 2026 offering marathon, half marathon, 10K and a six hour hill climb that uses repeated 2.5 mile up and down laps. The event includes a costume contest with solo and team awards.

Sun 20 Dec 2026

San Diego, California

Website Registration

6 hour 26 miles 13 miles 10 kilometers

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Dirty December Trail Run

Dirty December Trail Run takes place Sunday, Dec 20, 2026 in San Diego, CA. The event features multiple race options and a holiday theme.

Marathon
1/2 Marathon
10K
Hill Climb 6HR using repeated 2.5 mile up and down laps

A costume contest is part of the event with two award categories: solo costume and team costume. The event is described as a low key holiday trail run, with awards for costume winners.

The new Hill Climb 6HR race challenges participants to complete as many 2.5 mile laps as possible within six hours. Lapped distances progress in 2.5 mile increments, for example 2.5, 5, 7.5, 10 miles and so on. Winners of the hill climb receive King and Queen of the hill awards.

Registration closes on Fri, Dec 18 at 11:59 PM PT. Visit the organization's website for the most recent information.

6 hr

Hill Climb 6hr

26 mi

Marathon

13 mi

1/2 Marathon

10 km

10k