Saturday 7:00 AM  ·  $149 $169

No set distance. No finish line. One yard every hour until one runner is left, and the yard gets longer as the day turns.

Start at 7:00 AM Saturday on the 5K loop and run it once an hour through the gold. At 7:00 PM the yard becomes the 5 mile loop and stays there the whole night. At 7:00 AM Sunday it doubles to two 5K laps and locks there, on the hour, for as long as anyone can answer the bell.

• You must be inside the corral when the bell rings. No late starts.
• Any yard not completed inside the hour ends your race.
• Check in at the start and finish line on every lap, and at every manned station.
• No personal aid, pacing or company on course while a yard is in progress.
• Headlamp required from the 7:00 PM yard onward. Backup light recommended.
• Every mile counts toward the Rio Colorado 250.

One title, one name: Sole Survivor. Everyone else is recorded with their total yards, as the format requires.

Photographers call the hour after sunrise and the hour before sunset the golden hour, and at Shaffer Bend in late October they are the two best hours of the year. Run one, or run both. Either can be run or rucked.

8:30 AM to 7:00 PM  ·  $99.99

13.1 miles. Same trail. Weight on your back.

Rucking is covering ground with a loaded pack. Same course as the half marathon and the same 8:30 AM start, with two extra hours on the clock because a loaded pack earns them. The difference is what you are carrying and who you are racing.

Ruckers are scored as their own division with their own results and their own awards. You are not competing against the runners and they are not competing against you.

• Weigh in before the start. Bring your pack to the start area by 8:00 AM. We weigh it, we tag it, you go.
• Water does not count. Hydration, food, phone and layers sit on top of the minimum. The weight is dry weight.
• Any weight is fine. Ruck plates, bricks, sand, books, dumbbells. It has to be secure and it has to stay in the pack for the whole course.
• You finish with what you started with. Weight is checked again at the finish. Anything under the minimum moves you out of the ruck division.
• Carry it yourself. No handing your pack off, no dragging, no wheels.
• Run, walk, or anything between. There is no rule about how you move, only about what you carry.
• Rucking counts toward your mileage exactly the same as running. Thirteen point one miles is thirteen point one miles.

A loaded pack on trail is harder than the same distance on your feet, and most people go out too quick. A few things that help:

• Train with the weight before race day. Even two or three loaded walks makes a difference to your shoulders.
• Get the load high and tight against your back. Weight that sits low and swings will wreck you by mile six.
• Wear socks and shoes you have already tested. Rucking changes how your feet hit the ground.
• Pack the weight so it cannot shift. Movement inside the pack is the most common reason people stop.

Every runner. Every distance. Every loop. You must check in at the start and finish line each time you complete a loop, and at every manned aid station you pass.

• Headlamp, required, with fresh batteries
• Backup light source, recommended
• Reflective clothing or vest

• Personal hydration system
• Cell phone for emergency communication
• Race director's number saved before you start

Every Fit Foundation finish counts toward the Rio Colorado 250. Complete 250 km across our races and the buckle is yours, on top of your individual race awards.

Timed events count the distance you actually cover, so the 12-Hour and the Gauntlet can each put a large number of kilometers on the board in a single weekend.

• Early start: from 7:45 AM, ahead of most of the field.
• Extended cutoff: 7:00 PM, well beyond the standard cutoff for these distances.
• The extended cutoff never runs past park closing or sunset.

• The same finisher medal as the full field.
• Listed in the Exceptional Athlete results for your distance.
• Your distance counts toward the Rio Colorado 250.