The Summer’s End Half Marathon & 5k is held in Richland, WA. The half marathon and 5k events have a registration cap of 200 runners. This race is set along the Columbia River and Richland’s riverfront parks. The events start at the Columbia Point Marina, passing through autumn scenery, through Howard Amon park, Leslie Groves Park and beyond. There are aid stations every two miles with water, Gatorade, and gels.