: Breeds. to but widely distributed aerialist mid May-late Jul in towns with Bar Harbor the most reliable location.
: but beginning early May with from late Apr, and again early Aug-early Sep with to late Sep.
Miscellany: Historically, Chimney Swifts nested in hollow trees but quickly adopted human chimneys and other structures when those appeared. Nests are fastened to vertical walls with the species' glue-like saliva.
Last Reviewed: May 27th, 2026