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Mendocino Coast 50K Course Guide

The Mendocino Coast 50K is one of the more approachable ultras you can run in California, and it is one of the prettiest, a runnable, low-vert tour of the North Coast that runs up the Big River, through redwoods, past the Russian Gulch waterfall, and out onto the Mendocino headlands above the Pacific. It is fast and it is scenic. In this guide I will walk you through the course, then give you pacing and fueling that actually fits a runnable coastal 50K, plus free tools to dial in your own numbers.

⏵ Quick facts

The Mendocino Coast 50K at a glance

Date
Sat, April 17, 2027 (annual, each April)
Location
Mendocino, CA (North Coast, near Fort Bragg)
Start / Finish
Big River State Park, just south of Mendocino Village
Distance
50K (one distance option)
Elevation gain
Low and rolling for a 50K, no major sustained climbs
Aid stations
Five aid stations along the course
Time limit
9.5 hours, finish by 5:00 PM (7:30 AM start)
Qualifier
Not advertised as a WS / UTMB / Hardrock qualifier

One thing to know: the race runs every April. The official site lists the next one as Saturday, April 17, 2027, after the April 18, 2026 edition. Elevation, exact aid station mileages, and cutoffs can move year to year, so always check the current date, route, and cutoffs on the official Mendocino Coast 50K site before you plan your race.

The course

The Mendocino Coast 50K starts and finishes at Big River State Park just south of Mendocino Village. It strings together river trail, redwood forest, fire road, and coastal bluff paths into a 50K that is runnable and low on vertical gain, with no big sustained mountain climbs and no altitude to deal with. What you get in return is the scenery, and it is some of the best in any California ultra: a river, redwoods, a waterfall, and the open Pacific headlands.

Up the Big River and into the redwoods

The early miles head up the Big River on gentle, mostly flat trail, then push deeper into redwood forest. This is fast, runnable ground, and that is the trap on a course like this. With no climb to force you to back off, it is very easy to bank what feels like free time in the first hour and quietly burn through your legs.

Use the early Big River miles to settle into your goal effort, not to chase it. Lock in a rhythm you can hold and start your hourly fueling here, while everything still feels easy, so the back half is about holding form instead of clawing it back.

Russian Gulch and the waterfall

From there the route works west toward Russian Gulch and past its waterfall, on forested trail that rolls rather than climbs. The footing is friendly compared to a technical mountain ultra. But rolling coastal trail has its own rhythm of small ups and downs, and they will nibble at your pace if you fight them.

Power-hike the short steeper pitches on purpose and run the grades you can run, instead of trying to hammer one pace across all of it. The little things add up over 31 miles, smooth transitions and steady fueling, so do them well.

The Mendocino headlands finish

The home stretch puts you out on the Mendocino headlands, running the bluffs above the Pacific back toward the finish at Big River. After miles in the forest, the open ocean is a real lift. And on a runnable course this is where an honest first half pays off, because you get here with legs to run the finish instead of just surviving it.

This is the part to save something for. If you paced the river and the gulch honestly, the headlands are where you press, and you let the runnable bluff trail and the ocean carry you to a strong, smooth close.

Aid stations and cutoffs

You have five aid stations on course with water, electrolyte fluids, and food, and the overall time limit is a generous 9.5 hours off a 7:30 AM start, with a 5:00 PM finish cutoff. There are intermediate aid station cutoffs in the afternoon too, so check the current chart on the official site and keep moving with margin on them.

For most trained runners the cutoffs are not what you worry about here. But if you plan to hike a good chunk of this, work backward from the aid station cutoffs and leave yourself a buffer, so the afternoon checkpoints never put you in doubt.

Pacing strategy for the Mendocino Coast 50K

A runnable, low-vert 50K rewards holding back early and having legs late. There is no big climb to slow you down, so the discipline has to come from you. Pace by effort and bank patience, not pace.

Run the first half honestly

On a course this runnable, the most common mistake is going out too fast on the flat early Big River miles, because they feel effortless. Hold your goal effort with margin for the first half. The runners who finish strong on the headlands are almost always the ones who left a little in the tank up the river.

Use our free grade-adjusted pace calculator to turn your flat fitness into honest effort targets for the gentle rolling sections, so you know whether your early pace holds up for all 31 miles or is a check you cannot cash.

Set a realistic goal time

The course is fast and low-vert, so your finish goal should look like a runnable 50K, not a slow mountain grind. Pick a target that fits the rolling profile and your fitness, then pace backward from it. Going out at a goal pace your training does not support is the surest way to fade on the back-half bluffs.

Use our vert-aware race time calculator to fold the modest rolling gain into a realistic projected finish, and our race equivalent calculator to sanity-check that goal against a recent race before you commit to it on the start line.

Save your legs for the headlands

The Mendocino headlands finish is where a smart race comes together. If you ran the river and Russian Gulch within yourself, you get to the bluffs with runnable legs and an ocean view to chase, and you can close hard. If you overspent early, those same headlands turn into a long, exposed survival shuffle.

Pace the whole day so you get to the headlands wanting to run. That one decision, holding back in the forest, is what turns a runnable course into a fast finish instead of a slow one.

Fueling strategy for the Mendocino Coast 50K

Cool, often foggy April weather on the North Coast usually takes heat off the table. So fueling here is mostly about steady carbs and sensible electrolytes across a runnable four-to-nine-hour day.

Carbs: steady and trained

For a 50K of roughly four to nine hours, aim for about 60 to 90 grams of carbohydrate per hour, leaning to the high end once your gut is trained to take it. Use a glucose-plus-fructose blend so you can absorb more than a single sugar lets you, and practice your exact hourly number on long runs so it feels normal on race day instead of new.

On a runnable course it is tempting to skip fuel when you feel good early, and then you bonk late. Stay on your hourly schedule from the first aid station so the tank never runs dry on the back-half bluffs.

Sodium and fluid: matched to cool coastal weather

The Mendocino coast in April is usually cool and often damp or foggy, so your sweat rate and fluid needs run lower than they would at a hot inland race. Match your sodium to your own sweat rate instead of overloading it, and carry enough fluid to cover the gaps between the five aid stations without sloshing around.

Dial in a plan that fits you with our free ultra fueling calculator. Put in your weight, goal time, and the cool conditions you expect, and it gives you a carb, sodium, fluid, and caffeine number per hour built for this 50K. Then go test it on a long training run.

⏵ Free calculators for this race

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⏵ Train for the Mendocino Coast 50K

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Mendocino Coast 50K FAQ

How hard is the Mendocino Coast 50K?

The Mendocino Coast 50K is one of the more approachable 50K ultras in California. It is a runnable coastal course along the Big River, through redwood forest, past the Russian Gulch waterfall, and out onto the Mendocino headlands, with low rolling elevation gain instead of the big sustained mountain climbs you get on a high-altitude ultra. The generous 9.5 hour cutoff and the mostly non-technical surface make it a strong pick for a first 50K, and the scenery plus the fast, runnable profile also make it a place where experienced runners chase a quick time. The real challenge is honest pacing and fueling across 31 miles, not surviving a brutal climb.

How much climbing is in the Mendocino Coast 50K?

Next to a mountain ultra, the Mendocino Coast 50K is a low-vertical course. It rolls along river trail, fire road, and coastal bluff paths instead of stacking up one or two giant climbs, so the total gain is modest for a 50K and there is no high-altitude effort to deal with. That makes it fast and runnable. But it also means there are few long climbs to force you to slow down, so the discipline has to come from you. Always check the current elevation profile on the official race site, then use a grade-aware pace tool to set honest targets for the gentle rolling sections.

How should I fuel for the Mendocino Coast 50K?

Fuel for a runnable 50K of roughly four to nine hours, depending on your speed. Most runners aim for 60 to 90 grams of carbohydrate per hour, leaning to the high end once your gut is trained, with sodium matched to your own sweat rate. The Mendocino coast in April is usually cool and often damp or foggy, so heat is not the limiter and your fluid needs run lower than a hot inland race. But you still need steady calories and electrolytes to hold pace late. Our free ultra fueling calculator turns your weight, goal time, and conditions into a per-hour carb, sodium, and fluid plan you can practice in training.

What are the Mendocino Coast 50K cutoffs?

The race has a 9.5 hour overall time limit off a 7:30 AM start, with a 5:00 PM finish cutoff, and intermediate aid station cutoffs along the way (for example mid-afternoon cutoffs at the later aid stations). That overall limit is generous for a runnable 50K, which is part of why the race works so well as a first ultra. Still, check the current aid station cutoff times on the official race site and build your plan with a buffer, especially if you plan to hike a good chunk of the course.

What is the course like and where is the race won or lost?

The course starts and finishes at Big River State Park just south of Mendocino Village. It runs up the Big River, into redwood forest, west toward Russian Gulch and its waterfall, then puts you on the home stretch along the Mendocino headlands above the Pacific. Because it is runnable and low-vert, the race is won or lost on pacing discipline. It is easy to run the flat, scenic early miles too hard and pay for it in the back half. Run the first half by feel with margin, then use the runnable terrain late, when the headlands and the ocean give you a finish to chase.

Is the Mendocino Coast 50K a good first ultra?

Yes. A runnable, low-vertical, mostly non-technical coastal course with five aid stations, a generous 9.5 hour cutoff, and cool spring weather is about as good as a first 50K gets. The scenery (river, redwoods, a waterfall, ocean bluffs) makes the day fun, and with no huge climb your training can focus on time on feet and steady fueling instead of mountain-specific vert. Check the current date and details on the official race site, build a simple 50K training block, and practice your fueling, so race day is a celebration and not a gamble.

This guide is for planning and training purposes and reflects publicly available information about the Mendocino Coast 50K. Race details, including the date, course, aid stations, elevation, and cutoffs, can change year to year. Always confirm the current specifics on the official Mendocino Coast 50K race website before you train or travel.