Lost Coast 55K

The Lost Coast 55K is a challenging ultramarathon held in Humboldt County, California, starting at the Horse Mountain Creek Trailhead near Whitethorn. Covering 34.3 miles with about 6,500 feet of elevation gain, the course features a mix of rough backcountry gravel roads and quiet pavement. The route ascends Saddle Mountain, offering potential Pacific Ocean views, then descends to Honeydew, the lowest elevation point, before returning to the start. The terrain varies from rugged dirt roads to paved sections, with occasional water crossings near the finish. The remote setting provides a wild, adventurous atmosphere with minimal traffic and scenic natural surroundings. Visit the organization's website for the most recent information.