Mendocino Coast 50K Course Guide

The Mendocino Coast 50K is a genuinely rolling 50K, not a flat coastal cruise. The official course map lists it as a 33 mile run with over 5,000 feet of elevation gain, climbing up out of the Big River canyon into Jackson Demonstration State Forest and Mendocino Woodlands before coming back down through Russian Gulch to the coast. The footing stays mostly non-technical the whole way, and the 9.5 hour cutoff is generous, so it is still a reasonable first 50K for someone who has trained on hills. The real challenge is pacing all that repeated climbing honestly, not surviving one brutal mountain.

Per the official course map, the race carries over 5,000 feet of elevation gain across about 33 miles. It is not one big mountain climb, it is a long string of rolling ascents and descents through Jackson Demonstration State Forest and Mendocino Woodlands State Park, roughly the middle third of the course, before the route drops back to Russian Gulch and the coast. The footing is friendly and there is no altitude to deal with, but do not mistake this for a low-vert course. Always check the current elevation profile on the official race site, then use a grade-aware pace tool to set honest targets for the climbing.

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.

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.

The course starts and finishes at Big River State Park just south of Mendocino Village. It follows the Big River on old haul road for a few miles, then around mile 4.75 cuts off onto singletrack and climbs into redwood forest and Jackson Demonstration State Forest for the middle third of the race, the section that stacks up most of the 5,000-plus feet of gain. From there it drops back down through Russian Gulch, where it climbs the East Waterfall Loop rather than passing the falls directly, before putting you on the home stretch along the Mendocino headlands above the Pacific. The race is won or lost on pacing that climbing honestly. It is easy to run the flat river miles too hard before the real work starts, and pay for it on the state forest climbs. Run the early miles by feel with margin, and save something for the headlands finish.

Yes, for a runner who has put real hills in their training. The footing is mostly non-technical the whole way, there are five aid stations, the cutoff is a generous 9.5 hours, and spring on the North Coast usually runs cool, all of which help a first-timer. But do not go in expecting a flat, easy course: the official course map lists over 5,000 feet of climbing across about 33 miles, so build a training block with real vert in it, not just time on feet. Check the current date and details on the official race site, and practice your fueling, so race day is a celebration and not a gamble.