12 Hours of Lawrence Woods

Enjoy 12 hours in the most underrated section of the Middlesex Fells Reservation, Lawrence Woods. What started as a casual conversation during a Wednesday night run evolved into a legitimate ultra endurance event, born from a desire to showcase technical trails and rugged elevation.

This is a low-key, high-grit loop race. We celebrate the “sneaky tough” terrain that even Fells regulars might miss—rocks, roots, and relentless undulation. No groomed paths here; just the authentic challenge of the Lawrence Woods trails.

Our philosophy is simple: Bring Your Own Everything (BYOE). We provide the course, the timing, and the community; you bring the self-sufficiency and the grit to see the 12 hours through.