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Montana Field Guide

Montana Field Guides

Black-throated Blue Warbler - Setophaga caerulescens

Native Species
Accidental Species

Global Rank: G5
State Rank: SNA

Agency Status


External Links

General Description
Species sexually dimorphic. Males have dark blue back, while their flanks, face, and throat are black; the lower part of underparts white. Females greenish-gray in color with a distinguishable white wing spot; also white stripe under wing.

For a comprehensive review of the conservation status, habitat use, and ecology of this and other Montana bird species, please see Marks et al. 2016, Birds of Montana.

Species Range

Western Hemisphere Range


Observations in Montana Natural Heritage Program Database
Number of Observations: 49

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density


SUMMER (Feb 16 - Dec 14)
Direct Evidence of Breeding

Indirect Evidence of Breeding

No Evidence of Breeding

WINTER (Dec 15 - Feb 15)
Regularly Observed

Not Regularly Observed


(Observations spanning multiple months or years are excluded from time charts)

During migration, species prefers forest edges, riparian woodlands, and other well-vegetated habitats, including parks and gardens. Species breeds in undisturbed deciduous/coniferous forests.

Food Habits
Diet consists of mostly insects; during winter, feeds on berries and fruit.

Reproductive Characteristics
One, two, or occassionally three broods per season; 4 eggs per brood. Incubation period 12 to 13 days. Nests usually built in shrubs or small trees.

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Citation for data on this website:
Black-throated Blue Warbler — Setophaga caerulescens.  Montana Field Guide.  .  Retrieved on , from