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⏵ Course guide · Nevada ultra

Red Rock Canyon Ultra Course Guide

The Red Rock Canyon Ultra is the signature trail race of the Las Vegas area, a desert run through sandstone canyons and sandy washes in the shadow of the Red Rock escarpment, just minutes off the Strip. It comes in three sizes (100K, 50K, and 17K), and the difficulty here is the heat, the exposure, and the soft sand far more than the climbing. I will walk you through the course first, then give you a pacing and fueling plan built for the desert. There are free calculators along the way to dial in your own numbers.

⏵ At a glance

Red Rock Canyon Ultra quick facts

Date
Saturday, November 14, 2026
Location
Red Rock Canyon NCA / Cottonwood Valley, start at the Red Rock Visitor Center, finish in Blue Diamond, NV (just off the Las Vegas Strip)
Distances
100K (about 62.5 mi) · 50K (about 31 mi) · 17K (about 10.5 mi)
Elevation gain
Rolling desert terrain in the shadow of the Red Rock escarpment, no single big climb; the race does not publish a per-distance vert figure, so confirm with the current course data
Start
100K: 7:00 AM (check-in 6:00 AM) · 50K: 8:00 AM · 17K: 9:30 AM
Cutoff
100K: roughly 22 hours (finish about 5:15 AM Sunday) · 50K: about 11.5 hours (finish 7:30 PM), both with intermittent aid-station cutoffs
Field cap
BLM caps the field; the first 200 entrants are guaranteed, then a waitlist (no listed Western States, Hardrock, or UTMB qualifier status)

These facts come from the official race site and UltraSignup. Check the current date, start times, cutoffs, and aid stations in the race-day details before you commit. Race logistics change year to year.

The course: where Red Rock is won and lost

The 100K starts at the Red Rock Visitor Center and runs the length of Red Rock and Cottonwood Valley before finishing in the town of Blue Diamond, working through Calico, Sandstone Quarry, the Grand Circle loop, washes, and limestone formations. The shorter 50K and 17K share the same desert character on smaller loops. It is rolling, not mountainous, and the race is won by whoever handles the sand and the sun best, not whoever has the strongest climbing legs.

The sand: the difficulty nobody warns you about

The washes are the real story here. Long stretches of this course run through soft, sandy desert wash, and that sand quietly eats your pace and your legs in a way the elevation profile never shows. On the 50K there is a stretch between roughly miles 7 and 15 that runners have nicknamed Dream Killer, because that is where a hoped-for PR tends to die. It is not steep. It is just relentless, soft, and exposed.

Do not fight the sand. Shorten your stride, keep your effort even, walk the softest patches if you have to, and let your watch pace look ugly without panicking. People who try to force road pace through the washes burn matches they need later. The ones who settle into a patient desert shuffle come out the other side with legs to spare.

The rolling profile and the sharper pitches

Most of the day is gentle, rolling desert in the shadow of the escarpment, with steady ups and downs rather than one big climb. There are a few sharper pitches that get your attention, like the climb runners call Hurl on the 50K (a gnarly ascent up and over before a Joshua tree forest and the Mud Springs aid station), and the feature named Satan{’}s Escalator that the 100K reaches near the end before the run into Blue Diamond.

Because the climbing is modest, this is a course where you can actually run a lot of it, which is a trap. Runnable terrain plus heat plus sand is how people overcook the early miles. Hold back early, keep something for the back half, and you will pass a lot of runners who went out hard in the cool morning air.

Aid spacing, exposure, and the 100K night

On the 100K and 50K the aid stations sit between about 5.5 and 8.5 miles apart at named spots like Lost Creek, South Oak Creek, Blue Diamond (which you pass twice), Mud Springs, Late Night, and Red Valley. That is a long way in the open desert, so carry enough fluid and calories to bridge each gap rather than counting on the next table being close. The 17K has no aid station at all, so you carry your own water and food start to finish.

The 100K adds a real overnight element. You start cold and dark before dawn, run through the heat of the desert day, and then push into a second night with a generous time limit that means a lot of runners finish well after dark. Plan for both a cold pre-dawn start and a long stretch in the dark: a working headlamp, backup batteries, and warm layers in a drop bag are not optional on the long one.

Pacing strategy for a warm, sandy desert ultra

Red Rock is about managing effort in the sand and the heat, not hitting a pace chart. Your flat-road splits will lie to you in the washes, so run by effort and let the time take care of itself.

Pace by effort, not by your road splits

A mostly rolling desert course tempts you to expect road pace, and then the sand and the sun make a mockery of it. Hold a steady, conversational effort, especially through the soft washes, and treat your moving pace as a rough guide instead of a target. A grade-adjusted pace helps you translate your real fitness into honest effort across the rolling sections, so you stop chasing a number the terrain will never give you and you do not blow up trying.

Build a finish prediction that respects the gaps

Do not guess your Red Rock finish off a flat road time. The sand, the heat, and the long carries between aid all add real minutes, and on the 100K the overnight slows almost everybody down. Build a finish prediction that accounts for this course and gives you a realistic window, then work back into the intermittent cutoffs so you know exactly how much buffer you have at each aid station instead of finding out the hard way.

⏵ Free tools to pace this course

Fueling strategy for the heat and the long gaps

The 50K is a several-hour warm desert effort and the 100K can be an all-day-and-into-the-night one, with long carries between aid. That makes carbohydrate, sodium, and fluid every bit as important as fitness.

Carbs: steady and trained

Aim for around 60 to 90 grams of carbohydrate per hour, and only push the higher end if your gut is trained for it. Desert heat blunts your appetite and slows your stomach, so keep intake steady and easy to swallow rather than gambling on big catch-up doses late. Practice your exact race-day carb rate on warm long runs so 80-plus grams an hour feels routine instead of like an experiment, and on the 100K build a plan for eating real food and staying awake through the dark hours.

Sodium and fluid: plan for the sun and the carries

In the desert heat, lean toward the high end on sodium, often around 500 to 700 milligrams per liter of fluid, and more if you are a heavy or salty sweater. Just as important, carry enough fluid to cover the 5.5-to-8.5-mile gaps between aid (and the entire 17K, which has none) instead of rationing to the next stop and arriving empty. Weigh yourself before and after a warm long run to find your real sweat rate, then build the plan around your own number rather than a generic one.

⏵ Build your fueling plan

Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and the Red Rock desert heat with the free ultra fueling calculator. Browse the rest of the free running tools at the tools hub.

⏵ Train for it with Summit Line

Get a race-day plan built around YOUR fitness, this exact Red Rock course profile, and your projected splits. Summit Line reads your real training, builds a plan for the heat and the sand, and rehearses your fueling so race day is something you execute, not guess at.

Start free →Explore the demo

Red Rock Canyon Ultra FAQ

How hard is the Red Rock Canyon Ultra?

It is more about heat, sand, and exposure than about big mountain climbing. The course rolls through the desert below the Red Rock escarpment on trail and sandy wash, so there is no single brutal climb, but the soft footing and long sun-baked gaps between aid wear you down. The 100K runs about 62.5 miles with a roughly 22-hour limit, the 50K is about 31 miles with around 11.5 hours, and both have intermittent cutoffs you have to keep ahead of. Smart fueling, heat management, and patience in the sand matter way more than raw leg speed here.

How much climbing is in the Red Rock Canyon Ultra?

This is rolling desert, not a vert monster. You spend the day moving through sandstone canyons, washes, and limestone formations in Cottonwood Valley, with steady up-and-down rather than one long mountain climb, plus a few sharper pitches like the section runners nickname Hurl and the feature called Satan{’}s Escalator near the end of the 100K. The race does not publish a clean per-distance elevation gain number, so do not trust a random figure; pull the current course file or GPX and read the real profile before you build a plan. Either way, expect the sand and the heat to cost you more time than the climbing does.

How should I fuel for the Red Rock Canyon Ultra?

Treat it as a warm, long desert day with stretches you have to carry yourself across. Most runners do well on roughly 60 to 90 grams of carbohydrate per hour, leaning higher only if your gut is trained for it, with sodium that climbs with the heat (often the high end of 300 to 700 mg per liter of fluid). The 100K aid stations sit between about 5.5 and 8.5 miles apart and the 17K has no aid at all, so carry enough fluid and calories to bridge the gaps instead of rationing to the next table. Run your own numbers for your weight, goal time, and the forecast with the free ultra fueling calculator.

What are the cutoff times for the Red Rock Canyon Ultra?

The 100K starts at 7:00 AM and gives you roughly 22 hours, with a finish cutoff around 5:15 AM Sunday morning. The 50K starts at 8:00 AM and runs about 11.5 hours, finishing by 7:30 PM. Both courses also have intermittent cutoffs at aid stations along the way, so you cannot bank all your buffer for the end. Confirm the exact intermediate cutoffs in the current race-day packet before you start, since they shift year to year.

What is the terrain and weather like at Red Rock Canyon?

You run on desert single-track and sandy washes through Aztec sandstone canyons and ancient limestone, with quarries, Joshua tree stands, and big escarpment views the whole way. The soft sand in the washes is the sneaky difficulty: it saps your legs and slows you down more than the grade does. Mid-November in the Mojave is usually cool and dry, but the desert sun can still push daytime temperatures into the 70s, and the 100K means a cold pre-dawn start and a long stretch of dark, so you are managing both ends of the thermometer in one race.

Is the Red Rock Canyon Ultra a good first ultra?

The 50K and 17K make solid first goal races for a prepared runner, and the relatively gentle profile helps. The catch is the desert: the sand, the exposure, and the daytime heat ask for specific prep, so train on soft and sandy footing, rehearse drinking and eating in the warmth, and respect the intermittent cutoffs. The 100K is a bigger ask with a real overnight component and self-carry between aid, so I would save that one for after you have a shorter ultra under your belt. If you train the sand and the gut, the generous time limits give most committed runners room to finish.

This guide is independent and for planning only. The course details, dates, start times, cutoffs, and aid stations come from public sources and can change year to year, so confirm the current specifics with the official race before you register or run. The fueling and pacing advice is general and not medical advice.