Cobbles naturally stabilize many California beaches, have been used to construct artificial protective berms, and will increasingly influence shoreline change in the face of sea level rise. However little is known about beach cobble distributions and the dynamics of cobble motion. A new project will use radio-frequency identification (RFID) technology to track individual cobbles at Torrey Pines State Beach in San Diego County. Rates and direction of cobble transport will be determined, and integrated with ongoing observations of incident waves, beach morphology, and cobble coverage to calibrate a model for the displacement (vertical, alongshore, and cross-shore) of the cobble component of mixed (sand and cobble) beaches.