C&O Canal 100

Name: C&O Canal 100
Start: 2026-04-25
End: 2026-04-25
Location: Knoxville

APR

2026

The C&O Canal 100 is a scenic 100 mile ultramarathon along the Potomac on the C&O Canal towpath, starting and finishing at Camp Manidokan on April 25, 2026. Expect smooth low elevation terrain, reliable aid stations and a Western States qualifier with registration opening January 1, 2026.

Sat 25 Apr 2026

Knoxville, Maryland

Website Registration

100 miles

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Event overview

The C&O Canal 100 is a 100-mile ultramarathon in Knoxville, Maryland held on April 25, 2026. The race starts, reaches halfway, and finishes at Camp Manidokan. The course runs along the C&O Canal towpath between Antietam and Brunswick, following the Potomac River and running near the Appalachian mountains. Registration opens January 1, 2026. The event is a WSER 2026 qualifier.

Course and support

The route is composed of one approximately 40-mile loop plus two approximately 30-mile loops.

~40-mile loop
~30-mile loops (two repeats)

There are about seven aid stations placed around each loop, with some stations visited multiple times. Distances between aid stations range from 3 to 6.9 miles. The course is described as low elevation with smooth terrain and takes place in temperate spring weather. Volunteers staff the aid stations, which are described as well stocked. Visit the organization's website for the most recent information.

100 mi

100 Miler