In Washington, Tufted Puffin (TUPU) populations have undergone widespread colony abandonment along with an order of magnitude population decline consistent with a general pattern of regional range contraction (Pearson et al., submitted). The primary objective of my research is to gain an understanding of the TUPU breeding population dynamics and trends on 3 active breeding sites in Washington (Destruction, Protection, and Smith Islands) by conducting an inter-annual comparison of variability in burrow occupancy and breeding success. This research complements concurrent TUPU diet research in Prof. Hodum’s lab which will inform conservation planning for TUPU populations