Mountain Lakes Trail Run & Walk - Princeton, NJ

Mountain Lakes Trail Run & Walk in Princeton, New Jersey offers a 5K+ trail run and a 3K walk through Billy Johnson Mountain Lakes Nature Preserve, with HQ at Community Park North Amphitheater. The course blends roughly 10% paved park trails, 30% utility service right‑of‑ways, and 60% single‑track terrain with rocks, roots, and logs. Proceeds benefit Friends of Princeton Open Space as part of Princeton Athletic Club support.

The walk is not timed; run timing may be at the finish (gun or chip). Registration is online only and limited to 200 participants. The event is on sabbatical for 2025 due to restoration. Visit the organization's website for the most recent information.