Lock 2 Lock Marathon/Half Marathon/10k

Prepare to run a unique and rewarding race at the Lock 2 Lock Marathon, Half Marathon, and 10k, returning for its 5th annual event on September 12, 2026, in scenic Williamsport, MD. This exceptional race unfolds entirely along the historic Chesapeake & Ohio Canal Towpath, offering runners a truly flat and fast course. Marathoners will tackle an out-and-back loop twice between Lock 44 and Lock 43, with a minimal elevation gain of no more than 40 feet. The half marathon features a single out-and-back loop, while the 10k runners enjoy a straightforward out-and-back toward Washington D.C., each with similarly gentle elevation changes. Runners can expect typical race day conditions with highs around 80F and lows around 60F, and a modest 12% chance of precipitation.

The Lock 2 Lock event boasts a USATF-certified course (MD22006NP), making it an excellent opportunity for those chasing a Boston Marathon qualifying time. The course itself is a highlight, described by runners as a beautiful, car-free path winding under leafy canopies with occasional glimpses of the Potomac River and charming canal locks. While predominantly crushed gravel and generally easy to run on, participants should be prepared for varying surfaces, including dirt, and potential navigation around minor obstacles like potholes, roots, rocks, and mud.

What truly sets this race apart is its renowned atmosphere and comprehensive runner support. Past participants rave about the "awesome camaraderie" and "friendly hometown vibe," with enthusiastic volunteers providing high-energy support at well-stocked aid stations. Aid stations, strategically placed frequently along the course for all distances, will offer water, Gatorade Endurance, pickle juice, potato chips, and other snacks, with a dedicated tarp at the Lock 44 start/finish line for personal nutrition needs. The start and finish for all distances are conveniently located at Lock 44, though runners should note that parking is limited directly at the lock and should plan to utilize designated parking at Cushwa Basin or Williamsport Park, a short walk away. Whether you're a first-time participant or a seasoned marathoner, the Lock 2 Lock promises a memorable and supported race experience.