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Leona Divide 50 Mile / 50K Course Guide

A spring race in the Angeles National Forest near Lake Hughes, California. You get smooth Pacific Crest Trail single track, long runnable climbs, and an exposed April day that is often hot. I will walk you through how the course runs, where it gets won and lost, and how to pace and fuel it, plus free tools to turn the plan into your own numbers.

Leona Divide at a glance

Next edition
Saturday, April 17, 2027
Location
Lake Hughes, CA · Angeles National Forest
Nearest hub
Palmdale / Lancaster, ~1.5 hr from Los Angeles
Distances
50 Mile · 50K (a 100K / 100M also run on the day)
Climbing (50 Mile)
Roughly 8,000 to 9,000 ft of gain
Climbing (50K)
Roughly 4,900 ft of gain
Terrain
Mostly PCT single track + dirt fire road, largely exposed
Conditions
Mid-April, often hot and dry, little shade; low altitude
Qualifier
Top finishers earn an AC100 (Angeles Crest) ticket; check current WSER status

Vert, cutoffs, aid-station spacing, and qualifier status vary by edition. Always confirm the specifics in the current official athlete guide before race day.

The course

Leona Divide is a runnable mountain ultra, not a technical scramble. The footing is mostly smooth and the grades are long and steady, and the day comes down to sun and exposure as much as the climbing.

Mostly PCT single track and dirt fire road

You spend most of the day on the Pacific Crest Trail and the Leona Divide truck trail through the Angeles National Forest, and the great majority of it is unpaved. The PCT single track here is smooth and flowing with only a few rockier patches, so a strong runner can move well and bank honest pace on the descents. Do not expect road-race aid stations. They are spaced for a trail ultra, so you carry between them.

And because so much of the route is exposed PCT with very little shade, the trail surface is rarely what holds you back. The sun is. That one fact shapes how you pace and fuel the whole day.

A shared start, then the 50K turns for home

The 50 Mile and 50K share roughly the same opening stretch out of the Lake Hughes start, climbing to gain the divide before the field strings out. From there the 50K hits its turnaround and heads back, while the 50 Mile keeps pushing deeper into the forest on a longer out-and-back before returning over the same ground.

What that means for you is the back half of each distance retraces ground you have already covered, but now in the heat of the day and on tired legs. The climbs that felt easy on the way out are the ones that decide your finish on the way home.

Where it is won and lost

There is no one decisive summit. Leona Divide is a vert-accumulation course, roughly 8,000 to 9,000 feet of gain over the 50 Mile and around 4,900 over the 50K, and it comes at you as a string of long, runnable grades instead of one brutal wall. You win it by holding an even effort over those rolling climbs and by not cooking yourself in the first sun-exposed miles.

And you lose it in the late-morning and early-afternoon heat. Go out hard while it is cool and you pay for it on the exposed return, where your pace falls apart, your stomach turns, and the aid-station cutoffs start to matter. Treat the first half as setup. The exposed back half is the real race.

Pacing strategy

On a runnable, climbing-heavy course with a hot back half, pacing is really just effort management. Two ideas carry the day. Pace the climbs by grade-adjusted effort, and bank your time before the heat, not after.

Run by grade-adjusted effort, not raw pace

Since Leona Divide stacks its difficulty into long grades, your raw pace is going to swing all over the place between the climbs and the descents. Chasing a flat goal pace uphill is how you blow up. Hold a steady effort instead and let your pace float with the terrain, hike the steeper pitches with purpose, run the gentle grades, and open up on the smooth PCT descents.

A grade-adjusted pace view lets you compare a 12-minute climbing mile to an 8-minute descending mile on equal effort terms, so you keep the throttle even across both. That even-effort discipline is the thing that protects your back half.

→ Grade-Adjusted Pace Calculator · see your true effort on the climbs and descents

Predict a finish that respects the vert

A flat-course prediction is going to badly overstate what you can run here. With 8,000-plus feet of gain on the 50 Mile, your finish comes down to how the climbing converts to time, not just your road fitness. Build your target around the actual elevation profile, pad it for the heat, then sanity-check your aid-station splits against the cutoffs.

And if you are stuck deciding between the 50K and the 50 Mile, or coming off a road marathon time, an equivalent-performance estimate helps you set a realistic goal before you ever pick a pace.

→ Race Time Calculator · a vert-aware finish prediction for this course

→ Race Equivalent Calculator · translate a known result into a Leona Divide goal

Fueling and hydration strategy

April in the Angeles National Forest can be warm and dry, and the PCT sections give you almost no shade. Heat plus exposure is the whole fueling story here. It pushes your fluid and sodium up, and it is why so many runners fade in the afternoon.

Fuel for the heat, not just the distance

On an exposed, often hot course your sweat rate climbs, and your need for fluid and sodium climbs right along with it. Drink to a real plan instead of to chance, keep your sodium toward the high end of the usual 300 to 700 mg per liter range, and hold your carbohydrate steady at a rate matched to your finish time. Aid stations are spaced for a trail ultra, so carry enough to cover the gaps, and especially across the hottest midday stretch of the return.

The classic Leona Divide mistake is under-drinking early while it is still cool, then trying to claw it back once the nausea and dizziness show up. Stay ahead of it from the first climb.

→ Ultra Fueling Calculator · a per-hour carb, fluid, and sodium plan for this heat and your finish time

Free tools to dial your Leona Divide plan

Use these free, no-signup calculators to turn this guide into your own numbers, then let Summit Line stitch them all into one race-day plan.

See all free running tools →

⏵ Train for it with Summit Line

Get a race-day plan dialed to YOUR fitness, this exact course profile, and your projected splits. Summit Line reads your real training, builds the climbs and the heat of Leona Divide into your pacing and fueling, and trains your gut for the day, so race morning is something you execute instead of guess at.

Get started free →Explore the demo

Leona Divide FAQ

How hard is the Leona Divide 50 Mile / 50K?

It is a moderate-to-hard mountain ultra, and honestly the difficulty is not the footing. It is the climbing and the exposure. Most of the route is smooth Pacific Crest Trail single track and dirt fire road, so the trail itself runs well and you can move on it. What gets you is the vert stacking up, roughly 8,000 to 9,000 feet over the 50 Mile and around 4,900 feet over the 50K, and on top of that you have mid-April sun on a course with almost no shade. Handle the heat and the early climbs and it feels fair and fast. Ignore them and the back half makes you pay.

How much climbing does Leona Divide have?

The numbers across sources put the 50 Mile near 8,000 to 9,000 feet of total gain and the 50K around 4,900 feet. Both distances share roughly the same first stretch out of the start, then the 50K turns around while the 50 Mile keeps pushing deeper before it comes back. There is no single monster climb here. It is a string of long, runnable grades on the Leona Divide truck trail and the PCT, so the climbing is steady and not steep. For the exact profile in your race year, trust the official athlete guide over anything you read here.

How should I fuel and hydrate for Leona Divide?

Plan for heat and exposure first. April in the Angeles National Forest can be warm and dry with almost no shade on the PCT sections, and that pushes up both your fluid and your sodium. Match your carbs to your finish time (roughly 60 to 90 grams per hour for most runners), keep sodium toward the high end of 300 to 700 mg per liter of fluid, and carry enough between aid stations. They are spaced for a trail ultra, not a road race. Use our free ultra fueling calculator and it will scale a per-hour carb, fluid, and sodium plan to your weight, your goal time, and the forecast.

What are the cutoff times at Leona Divide?

There is an overall finish cutoff and there are intermediate aid-station cutoffs, and in hot years they have tightened. The exact times move around by distance and by edition, so check the current official athlete guide and do not trust a number from some old race report. Here is the planning rule: if your projected finish is close to the line, build your pacing around getting to the early aid stations comfortably ahead of their cutoffs. The heat later in the day is where people lose the time.

Is Leona Divide a Western States or UTMB qualifier?

It has been a known early-season Southern California ultra for a long time, and the top finishers in the longer distances earn a Sterling Silver ticket into the Angeles Crest 100 (AC100). The qualifier ties to Western States, UTMB, and Hardrock change year to year and by distance, so check the current status on the official race page and on the destination race qualifier list before you count on it. And even when it is not a direct golden-ticket race, it is a strong, well-run spring tune-up for a summer hundred.

When is Leona Divide 2027 and where is it?

The next one is set for Saturday, April 17, 2027, in Lake Hughes, California, out in the Angeles National Forest about an hour and a half from Los Angeles and roughly half an hour west of Palmdale. It has run each spring out of the Lake Hughes area for decades. Confirm the date and start times on the official KH Races / Keira Henninger event page before you book travel, because race dates can shift.

The course details here are pulled from the official race materials, UltraRunning.com, and runner reports, and I kept things general where a specific figure could not be confirmed across sources. Elevation, cutoffs, aid stations, and qualifier status can all change year to year. Confirm the current specifics on the official race page before you race or book travel.