Peacock Gap Trail Run

Peacock Gap Trail Run is held in San Rafael, California, on Saturday, December 5, 2026, and is organized by Inside Trail Racing. Three trail distances are on the schedule: a 30K (18.6 miles) and a half marathon (13.1 miles), both starting at 8:30 a.m., and a 10K starting at 9:00 a.m. All three are run on trails rather than roads.

Having three distances on the same morning makes this an easy race to match to your current fitness. The 10K is a reasonable first taste of trail racing if you normally run roads, the half marathon suits anyone with a regular weekend long run, and the 30K is the step up for runners thinking about an ultra next year. Whichever you pick, spend part of your training on hilly, uneven ground and get used to running by effort rather than pace, since trail splits vary far more than road splits. Eight to twelve weeks of consistent running covers the shorter two.