: Singing males that show up occasionally late Jun-late Jul for a few days to a week and then disappear are thought to be birds dispersing from distant breeding areas.
Migration: mid May-mid Jun and again mid Aug-late Sep with peak mid/late Aug and to late Oct, in deciduous woods and where migrants concentrate.
Miscellany: Tennessee Warbler is a spruce budworm specialist and its numbers fluctuate depending on the scope of budworm outbreaks. Breeding numbers were known to increase 10-fold during the course of a major outbreak. Tennessees were a breeder here in the late 20th century when there were regular budworm outbreaks, but with the absence of the latter, nesting has not been confirmed.
Last Reviewed: August 6th, 2026