A-Line Trail is a hiking trail in Baywood-Los Osos, California. It is within Morro Dunes Natural Preserve and Montaña de Oro State Park. It is 0.5 miles long and begins at 142 feet altitude. Traveling the entire trail is 1.1 miles with a total elevation gain of 56 feet. Near the trailhead there is parking. Near the end of the trail is a tree.