The Trinidad to Clam Beach Run began in the 1960s in Humboldt County, California as an 8.75-mile (14.08 km) winter training race for track and field athletes attending Humboldt State University. The event grew into a nationally known run and added a 3-mile (4.8 km) and 5+3⁄4-mile (9.3 km) race. A half marathon was added in 2002, but was discontinued until 2017 when it resumed.