⏵ Course guide · Sonoran Desert 105 miler
El Jefe 100 runs 105 miles point-to-point through remote Sonoran Desert singletrack near Superior, Arizona, 12,548 feet of gain and 13,910 feet of loss through saguaro, palo verde, and mesquite Sky Island wilderness. I will walk you through the course and terrain first, then give you a pacing and fueling plan built for a remote, aid-sparse desert 100. There are free calculators along the way to dial in your own numbers.
These facts come from the official Destination Trail event page. Check the current year details, cutoffs, and aid stations before you commit. Race logistics change year to year.
El Jefe 100 runs point-to-point across 105 miles, almost entirely on remote singletrack through classic Sonoran Desert terrain on National Forest Lands.
"Deep in the Sonoran Desert, a lone jaguar once roamed the Sky Island wilderness. Known as El Jefe, 'The Boss' he became a symbol of the wild resilience of this landscape." The race is a direct tribute to that spirit, and the terrain lives up to it: saguaro, palo verde, and mesquite stitching a scrubby green canopy across genuinely remote country.
The course gains 12,548 feet and loses 13,910 feet, a net descent that reflects the point-to-point route from start to finish. Do not read that gap as an easy day: over 12,600 feet of climbing spread through remote desert singletrack is a serious elevation profile on its own.
With just 6 aid stations for the full distance, roughly a station every 17 to 18 miles on average, this course asks for real self-sufficiency between stops. Plan your carrying capacity accordingly, especially given desert heat and sun exposure through the exposed sections.
A 36 hour cutoff against 12,548 feet of gain and sparse aid means your pacing plan needs to account for both elevation and self-sufficiency between stations.
Since El Jefe 100 loses more elevation than it gains, a flat per-mile pace target undersells the climbing sections and oversells the descents. A grade-adjusted pace target gives you an honest number for both, so you don't burn your legs on the early climbs only to find the technical descents harder than expected.
With aid stations spaced roughly 17 to 18 miles apart, use your splits between the first couple of stations to build a vert-aware finish prediction rather than relying on a generic 100 mile time. Check that projection against the 36 hour cutoff early enough to adjust your effort, not your carrying strategy, mid-race.
⏵ Free tools to pace this course
With only 6 aid stations across 105 miles, your fueling plan needs to bridge real distance between resupply points, in April Sonoran Desert conditions that can already run warm.
Aim for roughly 60 to 90 grams of carbohydrate per hour, and sodium in the 300 to 700-plus mg per liter range, leaning higher if the day turns hot. Because stations sit roughly 17 to 18 miles apart on average, plan exactly what you carry out of each one rather than assuming the next stop is close.
Arizona's Sonoran Desert can deliver real heat well before summer, especially through exposed saguaro and palo verde terrain with limited shade. Build in extra fluid capacity and a heat-adjusted sodium plan rather than assuming spring temperatures automatically mean mild conditions.
⏵ Build your fueling plan
Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and sparse-aid Sonoran 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 Sonoran Desert climbing profile, and your projected splits. Summit Line reads your real training, builds a plan for sparse-aid desert terrain, and rehearses your fueling so race day is something you execute, not guess at.
El Jefe 100 covers 105 miles point-to-point through remote Sonoran Desert singletrack near Superior, Arizona, with 12,548 feet of gain and 13,910 feet of loss, a net descent that means the course sheds more than it climbs overall. With only 6 aid stations across the full distance and a 36 hour cutoff, this is a race that demands real self-sufficiency between resupply points on top of the elevation change.
The official course specs list 12,548 feet of cumulative elevation gain and 13,910 feet of loss over the 105 mile point-to-point route. That gap between gain and loss reflects the net descending profile of a point-to-point desert course, though don't mistake that for an easy run: it is still well over 12,000 feet of climbing spread across remote singletrack.
With only 6 aid stations across 105 miles, roughly one every 17 to 18 miles on average, plan your carrying capacity carefully between resupply points. Aim for roughly 60 to 90 grams of carbohydrate per hour, and sodium in the 300 to 700-plus mg per liter range given Sonoran Desert heat, which can be significant even in early April. Build your numbers with the free ultra fueling calculator before race day.
The overall time limit is 36 hours for the full 105 miles. Given the remote, aid-sparse nature of the course (just 6 stations) and nearly 12,600 feet of climbing, build real margin into your pacing plan rather than assuming a flat-course 100 mile pace will translate directly.
The course runs almost entirely on remote singletrack through classic Sonoran Desert terrain, saguaro, palo verde, and mesquite stitching a scrubby green canopy across the landscape, all on National Forest Lands in the Sky Island wilderness near Superior, Arizona. The race takes its name from a lone jaguar once documented roaming this Sky Island terrain, a symbol of the landscape's wild resilience.
It is a demanding one to start with. A remote, aid-sparse point-to-point course (only 6 stations across 105 miles) through desert terrain with nearly 12,600 feet of climbing asks for genuine self-sufficiency and desert heat experience. If this would be your first 100 miler, make sure you have trained specifically for carrying more between aid stops than a typical well-supported course requires, and have real desert-heat running experience before race week.
Link this guide
Race directors and clubs: link or embed this guide anywhere. It stays current.
<a href="https://runsummitline.com/guides/el-jefe-100">The El Jefe 100 course guide</a>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.