C&O Canal 100

APR

24

2027

A 100-mile ultramarathon on the C&O Canal towpath near the Potomac River, featuring one 40-mile loop and two 30-mile loops, staffed aid stations, low-elevation terrain, and volunteer support.

Sat 24 Apr 2027

Knoxville, Maryland

Website

100 miles

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C&O Canal 100

The C&O Canal 100 is a 100-mile ultramarathon held along the C&O Canal towpath near the Potomac River in Knoxville, Maryland. The course layout consists of one roughly 40-mile loop followed by two roughly 30-mile loops. The route runs between Antietam and Brunswick and stays close to the river and the Appalachian mountains for much of the distance.

The event uses Camp Manidokan as the start, halfway point, and finish location. Each loop includes about seven aid stations, some of which are visited multiple times, with distances between aid stations ranging from 3 to 6.9 miles. The course is described as having low elevation and smooth terrain, and it takes place in temperate spring weather.

Support on course includes staffed and stocked aid stations and a volunteer crew. The race is listed as a qualifier for WSER 2027. Practical details such as the official course map and a more detailed course description are provided by the organiser. Visit the organization's website for the most recent information.

100 mi

100 Miler