Pine Warbler is the only warbler species whose breeding and wintering ranges lie almost entirely within the United States and Canada. The species occurs year-round in the southeast and breeds in most of the eastern states and southeastern provinces. The maps above, compiled between 2003 and 2013, show where eBirders reported the warbler in January and April. In January, most Pines are in the southeastern states, often flocking with Eastern Bluebirds and Chipping Sparrows. Light purple squares indicate that a few warblers may winter north to New England and the Maritimes. The species, one of the earliest spring migrant warblers, is on the move from late February through early May. By April, look for it as far north as northern Minnesota and southern Quebec. Watch for it in pine trees.
eBird is the real-time online checklist operated by the Cornell Lab of Ornithology and Audubon. Marshall Iliff, Brian Sullivan, and Chris Wood are eBird project leaders. Submit your bird sightings at ebird.org.
A version of this article appeared in “Birding Briefs” in the April 2014 issue of BirdWatching. Subscribe.