Summit Line

⏵ Course guide · California ultra

The Peak 50K Course Guide

The Peak 50K is a climbing-heavy mountain 50K in Cuyamaca Rancho State Park near Julian, and it is built around one brutal idea: you summit Cuyamaca Peak twice and rack up something like 10,000 feet of total gain and loss along the way. It is widely considered one of the hardest 50Ks in San Diego County, and the vert is the whole story. I will walk you through the course first, then give you a pacing and fueling plan that fits all that climbing. There are free calculators along the way to dial in your own numbers.

⏵ At a glance

The Peak 50K quick facts

Date
Saturday, October 17, 2026 (historically a mid-July race, now fall)
Location
Camp Hual-Cu-Cuish, Cuyamaca Rancho State Park, near Julian, San Diego County, CA
Distances
50K, Marathon, and Half Marathon
Elevation gain
50K: about 10,000 ft of total gain and loss, with a double summit of Cuyamaca Peak
Start
6:00 AM (50K and marathon) · 7:00 AM (half marathon)
Cutoff
50K: 10 hr overall (4:00 PM finish), with intermittent cutoffs at Sweetwater and Cuyamaca Peak
Qualifier
Counts toward the SoCal Ultra Series · no Western States, UTMB, or Hardrock status listed

These facts come from the official race site and UltraSignup. The race has moved dates before (it used to run in mid-July), so check the current date, cutoffs, and aid stations in the race-day details before you commit. Race logistics change year to year.

The course: where The Peak is won and lost

The 50K is a lollipop out of Camp Hual-Cu-Cuish that climbs the Conejos Trail up to Cuyamaca Peak, drops a long way down toward the Sweetwater (Green Valley) side, runs a loop down low, and then drags you back up and over the peak a second time before the finish. About 10,000 feet of gain and loss, mostly on single-track. This is a climber’s race, plain and simple.

The first summit: up the Conejos Trail to Cuyamaca Peak

The day opens by going straight up. The Conejos Trail climb is roughly 2,200 feet over the first 6 miles or so to the top of Cuyamaca Peak, San Diego County’s second-highest summit, and how you handle this opening climb sets up your whole race. The temptation is to push it because your legs are fresh and the morning is cool. Do not. Hike the steep pitches efficiently, keep your effort honest, and get to that first summit with plenty in the tank, because you are going to be back here.

Up top you get the big payoff: high-country views over the park and a real sense of how much vertical this place holds. Soak it in, then get your head right for the descent, because the easy-feeling early miles are exactly where badly paced runners write a check the back half cannot cash.

The long descent and the low loop

From the peak the course drops hard, something like 2,800 feet down toward the Sweetwater and Green Valley area where the aid sits. This is fast, free-feeling downhill, and it is a trap if you bomb it. Long, steep descending on rocky single-track shreds your quads, and you need those quads for the climb back up. Run the descent controlled and let your legs turn over without hammering every step.

Down low the 50K runs its extra loop, the part of the lollipop that makes it a 50K instead of a marathon, before sending you back toward Sweetwater. This lower section is where you settle into your fueling rhythm and bank some honest forward progress, because the second half of this course is all about the climb that is still waiting for you.

The second summit: the climb that decides your day

Here is the part nobody warns you enough about: you have to climb back up to Cuyamaca Peak a second time, late in the race, on tired legs. That long descent you enjoyed earlier? You earn every foot of it back, and your day is genuinely decided on this second climb. Runners who paced the first half with discipline grind up steadily and finish strong. Runners who spent everything early fall apart here and limp it in.

There is an intermittent cutoff at the Cuyamaca Peak aid station on this return (around 1:30 PM for the 50K), so the second summit is also where the clock gets real. Know your splits, keep moving on the climbs, and once you crest the peak for the final time it is mostly downhill to the finish, where saving your quads earlier finally pays off.

Aid, cutoffs, and the gaps between

There are only three aid stations on course (Cuyamaca Peak, Sweetwater #1, and Sweetwater #2), so the gaps between them, especially the long climbs, are real. Carry enough fluid and calories to get yourself across them instead of assuming the next aid is close. The 50K cutoffs are layered: roughly 10:00 AM and 11:30 AM at Sweetwater on the two passes, 1:30 PM at Cuyamaca Peak on the return, and a 4:00 PM finish for a 10-hour overall limit.

Because the cutoffs are intermittent, you cannot save all your buffer for the end. Work backward from each checkpoint so you know how much cushion you actually have, and treat the second climb to the peak as the place where time gets tight if you let it.

Pacing strategy for a double-summit, 10,000-foot 50K

With roughly 10,000 feet of gain and loss and two full climbs of Cuyamaca Peak, The Peak is about managing effort, not chasing a pace chart. Run the climbs by feel, protect your quads on the descents, and keep the second summit in mind from the very first mile.

Pace the climbs by grade, not by the watch

Your flat-ground pace is meaningless on the Conejos climb or the second haul up the peak. What matters is grade-adjusted effort: hold a steady output you can sustain up the grade, and hike the steep pitches without feeling like you are giving up time. The classic mistake here is running the first climb too hard because it feels easy, then blowing up on that second summit. Use a grade-adjusted pace to turn your real fitness into honest climbing and descending targets, and you will not torch the front half.

Build a vert-aware finish prediction

Do not guess your finish off a road 50K time. The 10,000 feet of climbing, the double summit, and the technical single-track all add real time, and a flat extrapolation will leave you way behind your own plan. A vert-aware finish prediction that accounts for this course’s climbing gives you a realistic window and lets you work back into the intermittent cutoffs, so you know exactly how much buffer you have at Sweetwater and at the peak instead of finding out the hard way.

⏵ Free tools to pace this course

  • Grade-adjusted pace calculator to turn your flat fitness into honest targets for both climbs of Cuyamaca Peak and the long descents.
  • Race-time calculator for a vert-aware finish prediction on this course’s 10,000 feet of climbing, so you can plan against the cutoffs.
  • Race-equivalent calculator to turn a recent race result into a The Peak goal you can actually hold up all that vert.

Fueling strategy for the climbs and the duration

Most runners are out on The Peak 50K for somewhere around 6 to 10 hours, climbing hard, with only three aid stations and long gaps between them. That makes carbohydrate, sodium, and fluid every bit as important as fitness.

Carbs: steady and trained

For a 6 to 10 hour climbing effort, aim for around 60 to 90 grams of carbohydrate per hour, and only push the higher end if your gut is trained for it. Hard, sustained climbing makes it easy to forget to eat, and a slow stomach late in the race is how people unravel on that second summit. Keep your intake steady and easy to get down rather than gambling on big catch-up doses. Practice your exact race-day carb rate on long climbing days so 80-plus grams an hour feels normal, not like an experiment.

Sodium and fluid: cover the long gaps

Dial your sodium to how you actually sweat, often somewhere in the 300 to 700 milligrams per liter of fluid range, and toward the higher end if you run hot or you are a salty sweater. Just as important on this course: carry enough fluid to get across the long climbs between the three aid stations instead of rationing to the next one and arriving empty. Weigh yourself before and after a long climbing run to find your real sweat rate, then build the plan around your own number, not a generic guess.

⏵ Build your fueling plan

Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and all that Cuyamaca climbing 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 double summit of Cuyamaca Peak, 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

The Peak 50K FAQ

How hard is The Peak 50K?

The Peak 50K is one of the harder 50Ks in San Diego County, and it earns that reputation honestly. The 50K stacks roughly 10,000 feet of total gain and loss into the day, built around climbing Cuyamaca Peak (the county’s second-highest summit) twice on mostly single-track in Cuyamaca Rancho State Park. The first climb alone is about 2,200 feet over the opening 6 miles or so, then you drop close to 2,800 feet before you turn around and earn it all back. With a 10-hour overall cutoff and intermittent cutoffs along the way, steady climbing and smart fueling matter way more than flat speed.

How much climbing is in The Peak 50K?

The 50K is a serious climbing day: about 10,000 feet of total elevation gain and loss, per the official race description. The opening stretch is roughly a 2,200-foot climb over the first 6 miles or so to the top of Cuyamaca Peak, then a long descent of close to 2,800 feet toward the Sweetwater (Green Valley) area before the course sends you back up and over the peak a second time. The marathon shares the big numbers; the half marathon is shorter but still climbs the Conejos Trail toward the peak, so none of the distances here are flat.

What are the cutoff times for The Peak 50K?

The 50K has an overall limit of 10 hours, with the finish line closing at 4:00 PM off a 6:00 AM start. There are intermittent cutoffs you have to make along the way: roughly 10:00 AM at Sweetwater on the first pass, 11:30 AM at Sweetwater on the second pass, and 1:30 PM at the Cuyamaca Peak aid station on the way back. The marathon runs to an 8.5-hour limit and the half marathon to 4.5 hours. Confirm the exact intermediate cutoffs in the current race-day details, because times and locations shift year to year.

How should I fuel for The Peak 50K?

Treat it as a long, climb-heavy 6 to 10 hour day with only three aid stations on course (Cuyamaca Peak, Sweetwater #1, and Sweetwater #2), so the gaps between them are real. Most runners do well on roughly 60 to 90 grams of carbohydrate per hour, leaning higher only if your gut is trained for it, plus sodium that scales with how hard you sweat. Carry enough fluid and calories to cover the long climbs between aid instead of rationing to the next stop and showing up empty. Run your own numbers for your weight, goal time, and the forecast with the free ultra fueling calculator.

What is the terrain and weather like at The Peak 50K?

The course is mostly single-track through Cuyamaca Rancho State Park, starting up the challenging Conejos Trail out of Camp Hual-Cu-Cuish and working up to the Cuyamaca Peak summit. Expect rocky, sometimes technical footing, sustained climbs, and equally sustained descents, with big high-country views up top. The race now runs in October, when the Cuyamaca high country tends to be dry and pleasant, often somewhere in the 50s at the dawn start and climbing into the 60s or low 70s by afternoon, though mountain weather can swing. The historic mid-July date was hotter, so check the forecast for the actual edition you run.

Is The Peak 50K a good first 50K?

It can be a great goal race for a well-prepared first-timer, but it is not a gentle place to start. The double summit, the roughly 10,000 feet of vert, the technical single-track, and the intermittent cutoffs all reward specific prep: time climbing and descending long grades, comfort on rocky trail, and a fueling and hydration plan you have actually rehearsed on long days. If you train the climbs and the descents and you respect the cutoffs, the 10-hour limit gives most committed runners room to finish a genuinely hard, rewarding 50K.

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, 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.