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

Run Rabbit Run 100

5 km. It crosses Buffalo Pass at 3,140 m and Emerald Mountain, with a 36-hour time limit.

Prepare for Run Rabbit Run 100

A plan built from your answers and your race date.

trail training plan

Run Rabbit Run 100 takes place in the mountains above Steamboat Springs, in northwestern Colorado. The course combines ski area roads, forest singletrack and high-country sections around Buffalo Pass, topping out at 3,140 m, before dropping toward Emerald Mountain. Much of the route stays at altitude, and September nights up there are cold.

5 km, run on different days. The race is known for one of the largest prize purses in American 100-mile running, reserved for the Hares category. The time limit is 36 hours.

The formats

2 formats on the program.

Format	Distance
100 Mile	100 mi
50 Mile	50 mi

Organizer information, checked on September 21, 2026 · runrabbitrunsteamboat.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 September puts the start around March 29, 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

March 29, 2027

→ June 21, 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 Run Rabbit Run 100 in 2027?

The organizer has not published the 2027 date for Run Rabbit Run 100 yet. The race is usually held in September, in Steamboat Springs.

What is the Run Rabbit Run 100 time limit?

The cutoff is 36 hours for the 100-mile distance. That allows room to hike the high climbs, but it still requires short aid-station stops and steady forward progress through the night.

What experience do you need for Run Rabbit Run 100?

The 100-miler covers 161 km at altitude, with a high point at Buffalo Pass at 3,140 m. Prior experience at 50 miles or 100 km, plus time spent acclimating, is strongly recommended.

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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