A heads up to listen for this song in any woodlot but esp. ones that are dank and have dense tangles and a coniferous element (aka: Stony Swamp NCC trails). This species’ song is loud and piercing (similar to a Northern Waterthrush in that regard). Like other passage warblers, they are known to sing while they forage so knowing their song is key. The nice part: late afternoons – early evening (after work hours) are as good as any for searching for this highly-prized species. For example, I am heading out around 6:00 PM today in search of one!
Migration window in spring here in Ottawa is typically May 24-31.