Orange birds in California: a field calendar

Some time in March, a male Hooded Oriole lands in a fan palm on a San Diego street corner, surveys the fronds for last year’s nest stitching, and begins the season. The bird is a warm tangerine with a black throat and bill, and he has arrived, according to Audubon’s field guide, on a schedule he has been keeping since before the street existed.

California is where most of North America’s orange birds concentrate. The state’s mix of coastal scrub, Central Valley riparian corridors, and Sierra Nevada conifers means that a birder who moves with the calendar can log six orange species without leaving the state.

The orioles: two species, two habitats

The Hooded Oriole (Icterus cucullatus) is the most California-specific of the group. Males are burnt-orange above a black throat, with a white shoulder bar. Audubon records the bird’s length at 7.1 to 7.9 inches. It arrives in March - earlier than nearly any other neotropical migrant - and departs by August. Its singular habit is stitching its hanging grass nest to the underside of a palm frond, poking fibers through the leaf from below to sew the basket in place. Audubon documents that an early common name for the California subspecies was the Palm-leaf Oriole.

This relationship between bird and tree is not ancient. Cornell’s All About Birds records that Hooded Orioles expanded their California range northward as ornamental palms were planted in new suburbs - and by 2017 the species was using parks as far north as Arcata, well above its historical limit. The palm did not follow the bird. The bird followed the palm.

Bullock’s Oriole (Icterus bullockii) is the valley bird to the Hooded Oriole’s suburban one. Males carry a flame-orange face and breast, a black crown and eyeline, and a white wing patch that is visible at distance. Audubon gives the length as 6.7 to 7.5 inches and weight as 1.1 to 1.5 ounces. It breeds in riparian corridors - cottonwoods, willows, sycamores along watercourses - and is especially associated with the cottonwood groves of the Sacramento and San Joaquin valleys. Females build the nest without the male’s help: a hanging pouch woven from plant fibers, strips of bark, vine tendrils, and fine grass, suspended 10 to 25 feet up on a drooping branch. Audubon puts incubation at 11 days, fledging at 14. Fall migration begins early; many Bullock’s Orioles are gone from northern California breeding areas by the end of July.

The tanager in the pines

Male Western Tanagers nest in open conifer forests across the Sierra Nevada and pass through California’s valleys twice a year on a migration that can run from mid-April to mid-June northbound, according to Audubon’s field guide.

A male Piranga ludoviciana looks like an experiment gone right: a red-orange head, yellow body, and black wings with two white bars. Females are dull yellow with a gray back - useful camouflage at the nest, which Audubon places 15 to 65 feet up in a fir or pine. Clutch size is three to five pale blue-green eggs, incubation runs about 13 days. The Audubon field guide estimates the Western Tanager population at roughly 15 million individuals and describes it as widespread and common with no indication of decline.

In California, the species breeds in Sierra Nevada conifer forest and in higher-elevation mountains elsewhere in the state. During both spring and fall passages, tanagers appear in almost any habitat, including valley parks well below the tree line. The Audubon guide notes that the Western Tanager may also winter in California eucalyptus groves - a small but real exception to its usual pattern of wintering in Mexico and Central America.

The coast hummingbird

Allen’s Hummingbird (Selasphorus sasin) is the orange bird with the smallest footprint and the most specific address. Males have a green back and an iridescent orange-red throat that catches light differently at every angle. Females are, as Audubon notes, nearly identical to female Rufous Hummingbirds in the field. The species nests in brushy coastal canyons and wooded suburbs, and one nonmigratory subspecies is resident on the Channel Islands and on the Palos Verdes Peninsula of Los Angeles County.

Audubon records Allen’s Hummingbird at 3.3 to 3.5 inches in length, with a wingspan of 4.3 to 4.7 inches. The female builds a nest cup from green moss and plant fibers bound together with spider silk, camouflaged on the outside with bits of lichen. She incubates two white eggs for 17 to 22 days, then broods the nestlings for another 22 to 25. Audubon estimates the current population at 1.5 million and notes surveys show decreasing numbers over recent decades.

If you see a small orange-throated hummingbird along the California coast between February and July, it is almost certainly an Allen’s. If you see one in August in the mountains - the species moves through high meadows on its southbound route - it may be a Rufous passing through. The distinction matters because California is the core of Allen’s breeding range, while Rufous only passes through.

Two more worth knowing

The Black-headed Grosbeak (Pheucticus melanocephalus) is orange in a quieter register. The male’s head is black, the wings are black and white, and the breast and belly are a rich cinnamon-orange. Audubon describes him as a dull orange-brown with black head and black-and-white wings. He breeds in oak woodlands, cottonwood groves, and pine-oak mountains throughout western California and is common enough that his emphatic, rolling song is one of the defining sounds of a California May morning. Length is 7.1 to 7.9 inches, weight 1.4 to 1.7 ounces.

The Varied Thrush (Ixoreus naevius) arrives later in the year and only in the north. Males show an orange throat, orange eyebrow, and orange wing markings crossed by a dark breast band - an arrangement that makes them look as if two separate birds were assembled from the wrong parts. Audubon gives the length as 8.3 to 10.2 inches, the weight as 2.3 to 3.4 ounces, and the population at 35 million. The Varied Thrush breeds in mature Pacific Northwest coniferous forest and winters south into California, with numbers in the state varying considerably year to year. In winter it turns up in dense second-growth and moist woodlands, especially near streams. Point Reyes National Seashore is one of the more reliable spots on the California coast to find one foraging under the Douglas firs in January.

How to use the calendar

Species	When to look	Where in California	Key mark
Hooded Oriole	March - August	Southern coast, suburbs with palms	Tangerine with black throat
Bullock’s Oriole	April - July	Riparian corridors, Central Valley	Flame-orange face, white wing patch
Western Tanager	April - August	Sierra Nevada; valley parks on passage	Red-orange head, yellow body, black wings
Allen’s Hummingbird	February - July	Coastal scrub, wooded suburbs	Green back, iridescent orange-red throat
Black-headed Grosbeak	April - August	Oak woodlands, mountain forests	Black head, cinnamon-orange breast
Varied Thrush	November - February	Northwestern CA, moist forests	Orange eyebrow, dark breast band

The orange bird season in California runs from the first Hooded Orioles in late February to the last Varied Thrushes in March, which means it never fully closes. Something orange is always present in the state. The interesting point is that three of these six species are at or near the eastern edge of a coastal distribution that barely exists anywhere else in North America. Allen’s Hummingbird’s core breeding range is California. Orange birds in Ohio and orange birds in Michigan draw on a genuinely different cast - Baltimore Orioles, American Redstarts, Blackburnian Warblers - with almost no overlap. California’s list is not just longer in some months. It is structurally different.

For context on how California’s list compares to neighboring desert states, see orange birds in Arizona. For the eastern end of the Bullock’s Oriole’s range, where it hybridizes with the Baltimore Oriole along the Great Plains, see orange birds in Illinois.

The Hooded Oriole’s story is the one worth sitting with. A species extended its range by hundreds of miles not because the climate shifted or its prey moved, but because humans planted a tree in their front yards. The bird arrived before the gardeners had finished watering. It sewed its nest to the new palm fronds and kept going north.