Lock 2 Lock Marathon
Race Day Weather
Warming up, adjust pace later
Runners will face a temperature increase from 64°F at the start to 75°F by the finish, with humidity averaging 66%. Although the wind is light, it's advisable to start conservatively as conditions will become warmer later in the race. Hydration should be prioritized, especially in the later laps, to maintain performance.
Pace Calculator
Enter a finish time to see what race day does to it.
Get forecast alerts for Lock 2 Lock Marathon
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
Get your personalized Lock 2 Lock Marathon race plan
A mile-by-mile breakdown of where your time goes, weather-adjusted splits, fueling timeline with aid stations, packing checklist, carb tracker, spectator guide, all built around your goal and race-day conditions.
Race Info
The Lock 2 Lock Marathon runs along the flat, tree-lined C&O Canal Towpath in Williamsport, Maryland, out and back between Lock 44 and Lock 43. The marathon covers the 6.56-mile stretch twice, while the half marathon and 10K each run it once from later start times. With no more than 40 feet of total elevation change, the course is Boston Marathon-qualifying certified. The race is organized by 2 Lowe Run Company and a portion of proceeds benefits the Perinatal Bereavement Fund through the Meritus Foundation.
