: early-late May and again early-late Aug, with one record early Oct.
Miscellany: Up to the early/mid 1990s, Cliff Swallow was a breeder under favored structures along our waterfront, in towns, around farms and even in shore caves. Their populations plummeted shortly after and at present none are known to breed . The decline in aerial insects at about the same time is thought to have been at least partly responsible.
Last Reviewed: May 28th, 2026