We report the first known nesting of the Ashy Storm-Petrel and Cassin's Auklet in Monterey County, California, on offshore rocks around Castle Rock and Hurricane Point. Four nests and 13 mist-netted storm-petrels, together with the extent of suitable habitat, suggest a population of 10 to 30 pairs. A single abandoned Cassin's Auklet egg, pink guano, and a small number of other potential nest sites imply no more than five pairs of that species. Similar small colonies of these species may be scattered on offshore rocks along the central California coast, potentially linking the major colonies on the Farallon Islands and Channel Islands.