JFK 50 Mile Course Guide

JFK 50 is often called the oldest ultramarathon in America (1963) and the largest 50-mile trail race in the country, and the course earns that reputation in three distinct acts. The first 5.5 miles climb 1,172 feet to the Appalachian Trail, then 10 rocky, technical miles roll along the ridge before a steep 1,000-plus foot drop around mile 14.5. From there it is 26.3 flat, unpaved miles on the C&O Canal towpath, a section that is easy on the legs but brutal on the mind if you let the sameness get to you. The final 8.4 miles are rolling paved roads back to Williamsport. None of the three sections alone is extreme. Stringing all three together inside a 13-hour cutoff, with almost 15,000 entrants having finished it over 60-plus years, is what makes it a genuine test.

The race does not publish one total elevation-gain figure for all 50 miles, so treat the course by its three real sections instead of a single number. The opening 5.5 miles gain 1,172 feet on the way up to the Appalachian Trail, most of it before you even reach the singletrack. Around mile 14.5 the course drops more than 1,000 feet in a series of steep switchbacks off the ridge and down to the C&O Canal. The 26.3-mile canal section that follows is almost totally flat. The final 8.4 miles on paved country roads are gently rolling. Boonsboro starts at 570 feet elevation; Williamsport finishes at 452 feet.

Late November in Western Maryland is usually cool, sometimes cold, which helps carbohydrate tolerance but does not remove the need for a real plan across 13 hours on your feet. Aim for roughly 60 to 90 grams of carbohydrate per hour, and keep sodium in the 300 to 700 milligram per liter range. JFK runs a minimum of 14 aid stations stocked with colas, electrolyte drinks, water, sandwiches, salty and sweet snacks, energy gels, energy bars, and hot drinks at some later stops, at approximately miles 4, 9, 16, 19, 22, 25, 27, 30, 34, 38, 42, 44, 46, and 48. That density means you rarely go far without a refill, but do not let frequent aid replace a per-hour target. Build your numbers with the free ultra fueling calculator before race day.

The overall cutoff is 13 hours from the 6:30 a.m. start, with the finish line closing at 7:30 p.m. sharp. There is also a full ladder of intermediate cutoffs at every major checkpoint: 2.5 miles by 7:15 a.m., 9.3 miles by 9:15 a.m., 15.5 miles by 11:30 a.m., 27.3 miles by 2:00 p.m., 34.4 miles by 3:45 p.m., 38.7 miles by 4:45 p.m., 41.8 miles by 5:30 p.m., 46.0 miles by 6:30 p.m., and the finish at 50.2 miles by 7:30 p.m. Runners who miss any checkpoint must withdraw, and due to insurance and National Park Service rules, no one is allowed on course after 7:30 p.m. under any circumstance.

Crew access is restricted to three designated points to manage traffic and protect the National Park Service land the course crosses: Weverton Cliffs exit at 15.0 miles, Antietam Aqueduct at 27.3 miles, and Taylor's Landing at 38.7 miles. No bicycle handlers are permitted anywhere on the course, and the final 8.4-mile road section is closed to all but race, law enforcement, and local traffic between 11:00 a.m. and 7:30 p.m., so crew cannot follow you in for the finish. Pacers are not allowed at any point in the race.

The course runs point-to-point in a rough horseshoe shape and changes character completely three times. It opens on road and joins the Appalachian Trail at 2.5 miles for a very rocky, rolling ridge section through 15.5 miles, including two paved miles between 3.5 and 5.5. Personal listening devices are strictly prohibited on this section, since the AT here is dangerous, technical singletrack. The middle 26.3 miles run the C&O Canal towpath, an almost totally flat, unpaved dirt and gravel surface free of car traffic, a section many runners find mentally harder than the climbing. The final 8.4 miles are gently rolling paved country roads into Williamsport.