You will not stay alone. The San Francisco Trail Runners community is already waiting.

Trail-running community in San Francisco. Sunrise Mount Tamalpais runs, Presidio 10Ks, and ultra-prep for San Francisco Marathon and Quicksilver Trail races.
Group vibe
Hardy, early-rising, quietly proud of each other.
Example members. Real archetypes drawn from the people who already meet up here.
From Zurich
Ultra-marathon runner
From Taipei
Tamalpais sunrise regular
From Perth
Training for Trail San Francisco
From Delhi
10K-a-day addict
One number to sign up. Your group is already waiting on the other side.
Join Trail Runners