A trail runner on a grassy ridge above a sea of clouds

JFK 50 Mile

8 km ultramarathon run from Boonsboro to Williamsport in Maryland. Founded in 1963, it is the oldest ultramarathon in the United States and splits into three sharply contrasting sections.

Prepare for JFK 50 Mile

A plan built from your answers and your race date.

trail training plan

The JFK 50 Mile runs from Boonsboro to Williamsport in Maryland. The course breaks into three clearly separate sequences: a technical opening stretch on the Appalachian Trail, a long flat and uniform section on the C&O Canal towpath, and a closing run on rolling country roads to the finish line.

8 km. Founded in 1963, this is the oldest ultramarathon in the United States, which explains the consistently heavy demand for entries.

The formats

One format only.

Format	Distance
50 Mile	50.2 mi

Organizer information, checked on September 21, 2026 · jfk50mile.org

When to start

At this distance, a build usually runs 12 to 24 weeks. The 2027 date is not published, so counting back from November puts the start around May 31, 2027.

These ranges are working conventions, not a research finding — no trial has compared plan lengths against each other. What matters more is that the plan was built for the weeks you actually have, rather than shrunk down from a longer one.

How to choose your start date

When to start

May 31, 2027

→ August 23, 2027

Worth reading before you enter

Races and distances Trail distances: what changes off the road Distance stops being the useful number. What decides a trail race is how long you are out, how much you climb, and how much the descents have wrecked your legs by the end. Read Training Eating and drinking: what’s proven, what isn’t This is where confident advice most often runs ahead of the evidence. Some of it is well tested. Some is opinion wearing a number. And one common habit can kill you. Read Races and distances When to start preparing your race Most plans fail before the first session, because the block started too late and everything had to be squeezed. Counting back from the date is the dullest and most useful thing you will do. Read

Questions

What is the date of JFK 50 Mile in 2027?

The organizer has not published the 2027 date for JFK 50 Mile yet. The race is usually held in November, in Boonsboro / Williamsport.

What is the JFK 50 Mile course like?

8 km route has three parts: a technical opening on the Appalachian Trail, a long flat stretch along the C&O Canal towpath, and rolling country roads to the finish in Williamsport.

Other races

This list keeps growing; it draws no line. A race that is missing is prepared for in exactly the same way.

Honolulu · United StatesUltra HURT 100 Jan 16 Its five-loop, 20-mile-per-lap format carries a famously high drop-out rate. Bandera · United StatesUltra HOKA Bandera Endurance Trail Race January The HOKA Bandera Endurance Trail Race is a trail and ultra weekend held in Bandera, Texas, inside the Hil Moab · United StatesUltra Moab 240 Endurance Run January 7 km ultramarathon with 9,620 m of vertical gain, run as one continuous loop out of Moab, Utah. It is par Your race is not here? Tell us about your race You can prepare for it all the same. Any race, anywhere, and even a goal without a race.

Your race is on the calendar. Your plan should be too.

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