Summit Line

⏵ Course guide · California ultra

Twin Peaks Ultras Course Guide

Twin Peaks is one of the meanest, most vertical mountain ultras in Southern California, a 50 mile (plus 50K and 30K) over the twin summits of Old Saddleback in the Santa Ana Mountains. It is steep truck trail and rough singletrack, big sun, and a cutoff that bites. I will walk you through the course first, where it is won and lost, then give you a pacing and fueling plan that respects all that vert. There are free calculators along the way to dial in your own numbers.

⏵ At a glance

Twin Peaks Ultras quick facts

Date
Typically mid-October (confirm the current year is running)
Location
Indian Truck Trail, Corona, Santa Ana Mountains, Cleveland National Forest, CA
Distances
50 Mile (about 52.5 mi) · 50K (about 31 mi) · 30K (about 18.6 mi)
Elevation gain
50M: about 15,000 to 17,000 ft · 50K: about 9,000 ft · 30K: about 5,000 ft
Start
50M 6:00 AM (5:00 AM early start) · 50K 7:00 AM · 30K 8:00 AM
Cutoff
50M: finish by 9:45 PM, with a mile-25 cutoff (reach it by 1:45 PM or drop to the 50K)
Qualifier
No Western States, Hardrock, or UTMB Running Stones status listed by the race

These facts come from the official race site, UltraSignup, and public race recaps. Twin Peaks has been paused in past years over fire and trail closures, so confirm the current year is actually running, and check the date, cutoffs, and aid stations in the race-day details before you commit. Race logistics change year to year.

The course: where Twin Peaks is won and lost

The 50 mile is roughly 52.5 miles and 15,000-plus feet of gain, with almost all of the climbing packed into the first 42 miles. It is 100 percent dirt, a mix of wide truck trail and technical singletrack, up over Santiago and Modjeska Peaks and back. The 50K turns around at mile 25, and the 30K is the short loop. Whatever distance you pick, the same rule applies: this is a vert race wearing a distance race’s name.

The opening climb: Indian Truck Trail off the gun

You barely get warm before the work starts. Off the line near 1,200 feet you climb Indian Truck Trail, about 6.5 miles of fire road grinding up toward 3,800 feet, with a full aid station waiting at the top. This is the part that lures people into trouble. It is a steady, runnable-looking grade, and if you run it hard because the legs feel fresh you will hand that effort right back later. Hike the steep pitches, keep your output honest, and get to the top with plenty left.

From there the course works the Main Divide, the spine road that carries you toward the high country and the twin summits. The footing opens up but the climbing does not really let go. Old Saddleback is two peaks, Santiago at about 5,689 feet and Modjeska at about 5,496, and the long pull to that high ground is the heart of the day.

The high country and the technical singletrack

Up on the divide the views are huge and the exposure is real. Wind, sun, and not much shade. The race mixes that wide truck trail with nasty fun singletrack like the Upper Holy Jim trail, which drops off the divide on gnarly, rocky, scenic tread before linking back toward Indian Truck Trail. This is where quick feet and attention matter as much as fitness. Loose rock and steep, blind corners punish anyone who switches their brain off late in the day.

Because almost all the vert lives in the first 42 miles, the middle of the 50 mile is a sustained grind, not a place to make up time. Settle in, eat, and keep the effort even. The course is not done with you, but it stops adding fresh climbing once you are through the big stuff.

The descents: fast, free, and expensive if you blew the climbs

What goes up Indian Truck Trail comes back down it, and the back half is mostly descent. It is fast if you saved your quads, and a long limping shuffle if you did not. Miles of downhill on rough fire road and rocky singletrack wreck untrained legs, and the people who hammered the early climbs are the ones reduced to a walk on the way home. The mountain gives the time back on the descent, but only to runners who can still actually run downhill late.

Train controlled, runnable descending before race day, on real grades, until your quads can take it. Being able to keep your legs turning over downhill in the last 10 miles, when everything hurts and the sun is high, is genuinely what separates finishers from sufferers here.

The cutoff and the heat between aid

Twin Peaks has long enforced a mile-25 cutoff: hit it by about 1:45 PM or you get dropped from the 50 mile to the 50K. So you cannot just amble the first half and plan to grind it out late. You need to be moving with purpose from the Indian Truck Trail climb onward, which is exactly why over-cooking that opening grade is so costly. The overall 50 mile limit has historically been 9:45 PM, a genuinely long day, but the mid-race gate is what ends most early days.

The aid stations sit at the natural junctions (the top of Indian Truck Trail, points along the Main Divide, the Holy Jim area), but the gaps can be long and fully exposed, and mid-October highs around 81 cook the ridge by midday. Carry enough fluid and calories to get across the dry stretches instead of counting on the next stop being close.

Pacing strategy for a 15,000-foot day

With this much gain front-loaded into one mountain, Twin Peaks is about managing effort and beating the mile-25 cutoff, not chasing a pace chart. Run the climbs by feel, hike the steep stuff without guilt, and save your legs for a descent you actually want to run.

Pace the climbs by grade, not by the watch

Your flat-ground pace is meaningless on the Indian Truck Trail grade or the Main Divide pulls. What matters is grade-adjusted effort: hold a steady output you can sustain up the climb and power-hike the steep pitches efficiently. The classic Twin Peaks blowup is running the opening climb too hard because it feels easy, then falling apart on the descent and limping in. Use a grade-adjusted pace to turn your real fitness into honest climbing and descending targets, and you will not torch the first 25 miles before the cutoff even matters.

Build a vert-aware finish prediction, then work back to the cutoffs

Do not guess your Twin Peaks finish off a road time, or even off a flatter trail ultra. Fifteen-thousand-plus feet of gain, technical footing, and the heat add real hours. A vert-aware finish prediction that accounts for this course’s climbing gives you a realistic window and, just as important, lets you work backward into that mile-25 cutoff so you know exactly what split you need at the top of the divide. Race against the gate, not against the field.

⏵ Free tools to pace this course

Fueling strategy for a long, hot, climbing day

A 50 mile day at Twin Peaks can run well into the evening, much of it climbing in mid-October sun with long exposed gaps between aid. That makes carbohydrate, sodium, and fluid every bit as decisive as your fitness. Even the 50K and 30K ask for a real plan, not vibes.

Carbs: steady, trained, and uphill-friendly

For a long mountain effort, aim for around 60 to 90 grams of carbohydrate per hour, and only push the top end if your gut is trained for it. Climbing in the heat blunts your appetite and slows your stomach, so keep intake steady and easy to get down, and lean on things that go down while you hike rather than gambling on big doses late. Practice your exact race-day carb rate on hot, hilly long runs until 80-plus grams an hour feels routine, not like an experiment you are running on the divide.

Sodium and fluid: plan for the sun and the long gaps

On a hot Santa Anas day, lean to the high end on sodium, often around 500 to 700 milligrams per liter of fluid, and more if you sweat heavy or salty. Just as important, carry enough fluid to get across the long, exposed stretches between aid stations instead of rationing to the next one and arriving empty on the ridge. Weigh yourself before and after a hot long run to find your real sweat rate, then build the whole 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 Twin Peaks 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 Twin Peaks vert profile, and your projected splits. Summit Line reads your real training, builds a plan for all that climbing, and rehearses your fueling so race day is something you execute, not guess at.

Start free →Explore the demo

Twin Peaks Ultras FAQ

How hard is the Twin Peaks Ultras 50 miler?

Twin Peaks is one of the hardest mountain 50 milers in Southern California, full stop. The 50 mile course runs roughly 52.5 miles with somewhere around 15,000 to 17,000 feet of climbing on steep Santa Ana Mountains truck trail and singletrack, and almost all of that vert is stacked into the first 42 miles. You start near 1,200 feet and grind up over Santiago Peak (about 5,689 feet) and Modjeska Peak before the long pounding descent home. Add the mile-25 cutoff that bumps you to the 50K if you are slow, and you have a race that rewards patient climbing and a trained gut far more than raw speed.

How much climbing is in the Twin Peaks Ultras?

A lot, and it comes in big sustained blocks rather than rollers. The 50 mile carries roughly 15,000 to 17,000 feet of gain, the 50K is around 9,000 feet, and the 30K is around 5,000 feet, all in the Santa Ana Mountains over Old Saddleback. The signature climb is the long pull up Indian Truck Trail off the start, about 6.5 miles from roughly 1,200 feet up toward 3,800 feet, before the course works the Main Divide road toward the twin summits. Treat this as a vert race, not a distance race, and pace it accordingly.

What are the cutoff times for the Twin Peaks Ultras?

The 50 mile has historically given you until 9:45 PM to finish, which is a long day on its own. The cutoff that catches most people is at mile 25: reach it by 1:45 PM or you get pulled down to the 50K finish instead of continuing on the full course. That intermediate cutoff is strictly enforced, so you cannot bank your whole buffer for the back half. Always confirm the current year’s exact cutoffs in the race-day details before you start, because they move year to year.

What is the terrain and weather like at Twin Peaks?

The course is 100 percent dirt: a mix of fire road (the wide truck trails like Indian Truck Trail and Main Divide) and rough singletrack such as the Upper Holy Jim trail, with no pavement to speak of. Footing ranges from loose rock on the climbs to gnarly, technical, exposed singletrack on the descents, and the ridgelines bake in the sun. Mid-October in the Santa Anas tends to run warm, with average highs around 81 and lows around 56, so you can start cool and cook by midday up on the divide. Plan for heat and exposure even though it is fall.

Which peaks does the Twin Peaks Ultras climb?

The race is named for the twin summits of Old Saddleback, the landmark you see from most of Orange County: Santiago Peak at about 5,689 feet, the high point of the Santa Ana Mountains, and Modjeska Peak at about 5,496 feet just to the southeast. The dip between them is the saddle that gives the mountain its nickname. On the 50 mile you take the long way up the Main Divide to tag the high country before the course turns you around. That high stretch is where the views pay off and where the wind and sun can turn on you.

Is the Twin Peaks Ultras a good first 50 miler?

Honestly, no, this is not the place to break your 50 mile cherry. The climbing is relentless, the descents are technical and quad-destroying, the mid-October sun is real, and the mile-25 cutoff will end your 50 mile day early if you are underprepared. If you are set on it, come in with a real base of vertical training, time on technical singletrack going down, and a fueling and hydration plan you have rehearsed in the heat. A flatter, friendlier 50 miler first will teach you the distance without the Santa Anas trying to break you.

This guide is independent and for planning only. The course details, dates, cutoffs, and aid stations come from public sources and can change year to year, and Twin Peaks has been paused in some years over fire and trail closures, 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.