In the Upper Fraser Valley, this warbler generally increases in numbers during migration from west to east. Around Abbotsford and Chilliwack they are more rare than in Agassiz and Hope as an example. Rare in the Upper Fraser Valley in the summer. However, they almost approach a 'fairly common' status in the northeastern section of the checklist area especially around Boston Bar where they breed. Breeding has also been documented in the Skagit Valley and along the Coquihalla Highway not far out of Hope. Migratory, spends the winter from Mexico to Central America. This species of warbler is not well studied.

Similar species:
Bright adults in breeding plumage usually fairly distinctive. The red in the crown not always visible. Fall warblers are challenging with juvenile and non-breeding plumaged warblers the norm. Dull adults and juveniles are worth considering against their dull counterparts including Yellow Warbler, MacGillvray's Warbler and Orange-crowned Warblers. Note the yellow throat on the Nashville Warbler that contrasts with the face. The white eye-ring is complete.

Best viewing locations:
A trip to Boston Bar will yield several sightings especially during the early summer when males are singing and quite visible. Increasing records from the Hope area eastwards as well as breeding activity in Harrison.. During spring and fall migration, try warbler hotspots such as Maria Slough in Agassiz, Island 22 Regional Park in Chilliwack and Cheam Lake Regional Park near Bridal Falls.

Sources:
Ehrlich, Dobkin and Wheye, (1988)

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