Summit Line

⏵ Course guide · California ultra

Anza Borrego Cuyamaca 50 Course Guide

The Anza Borrego Cuyamaca 50, the ABC 50, is a net-descending, point-to-point 50 miler in San Diego County that starts cold and high at the Sunrise Trailhead, runs the Cuyamaca Mountains, and drops down Oriflamme Canyon onto the Anza-Borrego desert floor to finish at Stagecoach Trails. It is one of the more runnable big days in SoCal, but the long descent and the exposed desert run-in have their own teeth. I will walk you through the course first, then give you a pacing and fueling plan that fits a downhill course. There are free calculators along the way to dial in your own numbers.

⏵ At a glance

Anza Borrego Cuyamaca 50 quick facts

Date
Saturday, December 5, 2026
Location
Point to point from Sunrise Trailhead (near Julian) through Cuyamaca Rancho State Park to Stagecoach Trails in Shelter Valley, San Diego County, CA
Distance
50 miler, about 51 miles (roughly 81.6 km)
Elevation
Net descending, mountains to desert. Total gain is listed around 4,500 to 5,500 ft depending on the source, with a much larger net drop to the finish
Start
6:30 AM at the Sunrise Trailhead
Cutoff
Overall 14 hr 30 min (9:00 PM). Intermittent: about mile 25 (Paso Picacho) by 2:00 PM, mile 35.4 (Pedro Fages) by 4:30 PM
Qualifier
SoCal Ultra Series qualifier and has appeared on the UTMB Index. Not a Western States or Hardrock qualifier

These facts come from the official race site (Second Wind Trail Running) and corroborating listings. Check the current date, cutoffs, elevation, and aid stations in the race-day details before you commit. Race logistics change year to year.

The course: where the ABC 50 is won and lost

This is a true point to point, about 51 miles from the Sunrise Trailhead near Julian to Stagecoach Trails out in Shelter Valley. The day trends downhill, but it is split into three honest pieces: an early climbing block up in the Cuyamaca high country, a long descent off the mountains, and an exposed desert run-in to the finish. Roughly six aid stations break it up, and a couple of the late gaps are long.

The high country: get your climbing done early

You start cold and high, then drop into Cuyamaca Rancho State Park and do most of the day’s real climbing in the first half, including the pull up toward Stonewall Peak and the wooded trails around the lake. This is the part to run with discipline. The course gives back so much elevation later that it is tempting to hammer the climbs early because you know a downhill payday is coming, but that is exactly how you arrive at the long descent with nothing in your quads.

Keep the early climbs to a steady, repeatable effort and hike the steep pitches without ego. The high country footing is mostly friendly mountain single-track and fire road, but you are up at real elevation in December, so it can be genuinely cold here even when the desert finish will be warm. Start with enough layers to climb comfortably and plan where you will shed them.

Oriflamme Canyon: the long drop that defines this race

The signature of the ABC 50 is the long descent down Oriflamme Canyon in the back third, where you fall off the mountains and onto the Anza-Borrego desert floor. It is fast and it is fun if you trained for it. If you did not, it is where the race quietly ends for a lot of people, because miles of sustained downhill on loose, rocky trail will shred unprepared quads and leave you walking the flats afterward.

Practice controlled, runnable descending for weeks before race day, ideally on rocky ground, not just smooth road downhills. The skill here is staying light and quick-footed while keeping your braking under control, so you bank time on the drop without cooking your legs for the run-in that follows.

The desert run-in and the cutoffs

Once you are off the canyon you still have to cover exposed desert trail to the finish at Stagecoach Trails, and this is the back half where the day gets long and hot in the sun even though the morning was cold. Two intermittent cutoffs gate the course: you need to clear Paso Picacho around mile 25 by 2:00 PM and Pedro Fages at mile 35.4 by 4:30 PM, with an overall limit of 14.5 hours (9:00 PM). A couple of aid-station gaps on the back half run close to 9 or 10 miles, so this is not where you want to be caught short on fluid.

Run the math backward from those gates. Knowing the time you have in hand at Paso Picacho and Pedro Fages tells you how hard to push the early climbs and how much you can relax on the descent, instead of guessing and panicking when a cutoff sneaks up.

Pacing strategy for a net-downhill 50 miler

A downhill course is not a free course. The ABC 50 rewards runners who climb conservatively early, descend under control through Oriflamme, and have legs left for the exposed desert run-in. Run it by effort and grade, not by a flat pace chart.

Pace by grade, and respect the downhill

Your flat-ground pace does not tell you much on a course that climbs hard early and descends hard late. What matters is grade-adjusted effort: hold a steady, repeatable output up the early Cuyamaca climbs, and on the long Oriflamme descent let gravity help without letting your braking trash your quads. The classic ABC 50 mistake is treating the net-downhill profile as permission to go out hot, then arriving at the desert run-in with cooked legs. Use a grade-adjusted pace to turn your real fitness into honest climbing and descending targets so you stay even all day.

Build a finish prediction that respects the cutoffs

Do not guess your ABC 50 finish off a road 50 mile time. The early climbing, the technical descent, and the warm desert miles all change the math. A vert-aware finish prediction gives you a realistic window and, just as important, lets you work backward into the two intermittent cutoffs at Paso Picacho and Pedro Fages, so you know exactly how much buffer you should have when you hit each one instead of finding out the hard way.

⏵ Free tools to pace this course

Fueling strategy for a long day and big carries

Most runners are out on the ABC 50 for somewhere around 8 to 14 hours, starting cold and finishing in warmer desert sun, with a couple of long aid-station gaps on the back half. That makes carbohydrate, sodium, fluid, and layering all part of the plan.

Carbs: steady, trained, and protected from the heat

For a day this long, aim for roughly 60 to 90 grams of carbohydrate per hour, and only push the higher end if your gut is trained for it. The catch on this course is the temperature swing: the cold morning is easy to eat through, but the warmer desert run-in can kill your appetite right when you still have hours to go. Keep your intake steady and easy to get down, and practice your exact race-day carb rate on long runs so 80-plus grams an hour feels normal, not like an experiment you are running at mile 40.

Sodium, fluid, and layers: plan the swing and the gaps

Start with layers warm enough to climb in the cold high country, then have a plan to shed them before the descent and the exposed desert miles so you do not overheat. On sodium, a common range is around 300 to 700 milligrams per liter of fluid, leaning higher as the day warms up and more than that if you are a heavy or salty sweater. With about six aid stations and a couple of gaps near 9 or 10 miles late, carry enough fluid to actually cover those carries instead of rationing to the next table. Weigh yourself before and after a long run to find your real sweat rate, then build the plan around your own number.

⏵ Build your fueling plan

Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and the ABC 50 day 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 ABC 50 course profile, and your projected splits. Summit Line reads your real training, builds a plan for the early climbs and the long descent, and rehearses your fueling so race day is something you execute, not guess at.

Start free →Explore the demo

Anza Borrego Cuyamaca 50 FAQ

How hard is the Anza Borrego Cuyamaca 50?

The ABC 50 is a real 50 miler, but it is friendlier than a big-mountain race because the day trends downhill. You start cold and high at the Sunrise Trailhead, drop into Cuyamaca Rancho State Park, get the day’s honest climbing early (including a pull up toward Stonewall Peak), then spend the back half losing elevation hard down Oriflamme Canyon onto the desert floor. The trick is that a net-downhill course is not a free course: it wrecks your quads if you have not trained the descents, and the long, exposed desert run-in late in the day is where people fall apart. With a 14.5-hour overall cutoff, most prepared runners have room to finish if they pace the early climbs and protect their legs.

How much climbing and descending is in the ABC 50?

It is a net-descending point to point, so you lose far more than you climb across the full 51 miles. Total elevation gain gets reported a bit differently from source to source, roughly in the 4,500 to 5,500 foot range, with most of it stacked into the first half through Cuyamaca Rancho State Park, including the climb toward Stonewall Peak. The signature feature is the long drop down Oriflamme Canyon in the back third, which dumps you off the mountains and onto the Anza-Borrego desert floor toward the finish at Stagecoach Trails. Confirm the current elevation numbers on the official race page, since the exact figure varies by GPS and by year.

What are the cutoff times for the Anza Borrego Cuyamaca 50?

The overall cutoff is 14 hours 30 minutes, meaning you need to be in by 9:00 PM. There are two intermittent cutoffs you have to clear along the way: roughly mile 25 at the Paso Picacho aid station by 2:00 PM (about 7.5 hours), and mile 35.4 at the Pedro Fages aid station by 4:30 PM (about 10 hours). Because those mid-course gates exist, you cannot bank all your buffer for the end. Check the current race-day details for the exact intermediate cutoffs before you start.

How should I fuel for the ABC 50?

Plan for a long day, somewhere around 8 to 14 hours of moving time depending on your speed, with some big carries on the back half. Most runners do well on roughly 60 to 90 grams of carbohydrate per hour, leaning higher if your gut is trained for it, and you want that intake to stay steady even as the desert section warms up and dulls your appetite. There are about six aid stations, but a couple of the gaps run close to 9 or 10 miles, so carry enough food and fluid to cover them rather than rationing to the next table. 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 ABC 50?

The course mixes wooded mountain single-track and fire road through Cuyamaca Rancho State Park up high with rockier, more exposed canyon and desert trail as you drop. Early December at this elevation can be genuinely cold at the start, often near freezing, with daytime highs only in the low 50s, but the desert floor at the finish can feel a lot warmer in the sun. That swing is the planning problem: you want to start warm enough to climb, then shed layers before the long descent and the exposed run-in. Footing gets loose and rocky in spots, especially on the Oriflamme drop, so this is not a course to bomb blindly.

Is the ABC 50 a good first 50 miler?

It is one of the more approachable 50 milers in Southern California for a prepared first-timer, mostly because the net-downhill profile and the generous 14.5-hour cutoff give you room. That said, do not let "downhill" fool you into skipping the work. Train the descents specifically so the long Oriflamme drop does not destroy your quads, get used to back-to-back climbing and descending, and rehearse a fueling and layering plan for the cold start and the warm desert finish. Do those three things and the ABC 50 is a great first fifty.

This guide is independent and for planning only. The course details, dates, cutoffs, elevation, 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.