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

Mount Marathon Race

The Mount Marathon Race is a 5 km mountain race held in Seward, Alaska, every July 4. Runners climb and then descend Mount Marathon directly above the town and Resurrection Bay.

Prepare for Mount Marathon Race

A plan built from your answers and your race date.

trail training plan

The Mount Marathon Race is held in Seward, a small port town on Alaska's southern coast at the head of Resurrection Bay. The route leaves the town streets and goes straight up the flank of Mount Marathon on a mix of steep trail, roots, rock, loose scree and, depending on the year, lingering snow. The descent follows the fall line, with runners scree-skiing and sliding much of the way down.

The organization describes it as the toughest 5K on the planet: a short format that is vertical from start to finish and a major local event.

The formats

One format only.

Format	Distance
Course adultes	3 mi

Organizer information, checked on September 21, 2026 · mountmarathon.com

When to start

A build for this distance usually runs 12 to 24 weeks. Counted back from race day, that puts the start somewhere between January 11, 2027 and April 5, 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

January 11, 2027

→ April 5, 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 Mount Marathon Race in 2027?

Mount Marathon Race is run on Sunday, July 4, 2027 in Seward. Date published by the organizer, checked on September 21, 2026.

Is the Mount Marathon Race hard for only 5K?

Yes. The adult race is just 5 km but consists of a direct climb and descent of Mount Marathon. The organization calls it the toughest 5K on the planet, with steep, rocky and highly technical terrain throughout.

How do you train for the Mount Marathon Race?

Work very steep uphills, both running and power-hiking, and practice technical descents on loose scree. Strengthening quadriceps and ankles reduces the damage on the descent, which is the most committing part of the course.

Other races

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

Cool · United StatesTrail Way Too Cool 50K Mar 6 The Way Too Cool 50K is a 50 km trail race with 1,210 m of vertical gain held in Cool, California. It run Bellingham · United StatesTrail Chuckanut 50K Mar 20 The Chuckanut 50K is a 50 km trail race with 1,567 m of climbing, held in Bellingham, Washington State. F Mill Valley / Stinson Beach · United StatesTrail Dipsea Race June 9 km trail race from Mill Valley to Stinson Beach, California. First run in 1905, it is the oldest trail 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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