These data describe the inputs of giant kelp (Macrocystis pyrifera) to sandy beach ecosystems in the Santa Barbara Channel. The local dataset details the average number of kelp plants deposited in 100 m wide segments of coastline over the course of 66 months, from August 2015 through July 2021. Data are presented as the overall average as well as the seasonal averages for each segment. The coordinates of each segment are provided as well as the overall average dry beach width and the beach orientation for each segment. The regional dataset details the average wrack cover from cross-shore transects and the average number of kelp plants deposited on the 1 km stretch of beach for 24 sandy beach sites in a 100 km long region of coastline along the Santa Barbara Channel. The coordinates of each site are provided as well as the dry beach width and the beach orientation. Data are contained in two tables: 1) the local 25 km dataset with 250 total segments, and 2) the 100 km regional dataset with 24 total study beaches.