: mid Nov-late Apr on saltwater with to late May/early Jun. Most birds seen in mixed flocks of Herring and Great Black-backed Gulls. Unrecorded on fresh water.
Miscellany: Until the sardine packing plants shut down in the 1990s, up to five Glaucous Gulls per plant could be seen each feeding on the fish waste from the packing process. At present, it's very unusual to see more than a single bird.
Last Reviewed: June 9th, 2026