Lock 2 Lock Marathon/Half Marathon/10k 2026

Lock 2 Lock is a small race series on the C&O Canal towpath, featuring a marathon, half marathon, and 10K. All races start and finish near Lock 44. This is the event's fifth year. The marathon course is Boston Qualifier certified (MD22006NP). The marathon begins first, followed by the half marathon and then the 10K. Participants range from young 10K runners to marathoners up to age 99. The marathon course sends runners southeast 6.56 miles to Lock 43, where they turn around. This out-and-back is completed twice for the marathon and once for the half marathon. The route is very flat for a trail race, with a maximum of 40 feet of elevation change for the marathon and 20 feet for the half. Aid stations are frequent and stocked with water, Gatorade Endurance, pickle juice, potato chips, and snacks. Runners may leave personal race-day items on a tarp at the start/finish area.