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

Bighorn Mountain Wild and Scenic Trail Run

The Bighorn Mountain Wild and Scenic Trail Run is a trail and ultra event held between Dayton and Sheridan, Wyoming, in the Bighorn National Forest. Four distances are offered, from the 18 Mile up to the 100 Mile.

Prepare for Bighorn Trail Run

A plan built from your answers and your race date.

trail training plan

The Bighorn Trail Run takes place in the Bighorn National Forest in northern Wyoming, between Dayton and Sheridan. The terrain is classic Northern Rockies: high meadows, conifer forest, narrow singletrack and stream crossings. The course climbs to around 3,000 m, a factor worth planning for if you live near sea level.

Four distances share the weekend: 100 Mile, 52 Mile, 32 Mile and 18 Mile, which opens the event to seasoned ultrarunners and to people stepping up to long trail for the first time. Registration is scheduled to open on October 15.

The formats

4 formats on the program.

Format	Distance
100 Mile	100 mi
52 Mile	52 mi
32 Mile	32 mi
18 Mile	18 mi

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

When to start

At this distance, a build usually runs 12 to 24 weeks. The 2027 date is not published, so counting back from June puts the start around December 28, 2026.

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

December 28, 2026

→ March 22, 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 Bighorn Mountain Wild and Scenic Trail Run in 2027?

The organizer has not published the 2027 date for Bighorn Mountain Wild and Scenic Trail Run yet. The race is usually held in June, in Dayton / Sheridan.

What distances does the Bighorn Trail Run offer?

5 km and the 18 Mile over 29 km, all in Wyoming's Bighorn National Forest.

Is the Bighorn Trail Run course hard?

The course runs through mountain terrain, reaching about 3,000 m of elevation on Bighorn National Forest trails. Altitude and temperature swings weigh as much as the distance, especially on the 100 Mile.

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.

Build my plan

Secure payment with Stripe. Then allow about 30 minutes for your profile, in several sittings if you like.