Wasatch Front · Warblers

Warblers, bright & drab

In spring, the males hand themselves to you — face pattern, wingbars, and how much yellow name most of them in seconds. In fall, the drab immatures are the famous trap. This keys the bright birds cleanly and tells you, honestly, where the drab ones stop keying.

01

Wingbars, first

One objective cut splits our warblers nearly in half.

Plain-winged

No wingbars — mostly yellow or olive. The big group, and the hard one. Yellow, Wilson's, Orange-crowned, MacGillivray's, Nashville, Virginia's, Common Yellowthroat, the Chat.

Wing-barred

Two pale wingbars — grey, black & white. Only three locals: Yellow-rumped, Townsend's, Black-throated Gray. Wingbars isolate them instantly.

Then: how much yellow?

Among the plain-winged crew, the split is the face (§03) plus how far the yellow spreads — head-to-tail (Yellow), just the throat and undertail (Virginia's), or a masked/hooded face (Yellowthroat, MacGillivray's). Two odd ones sit outside the system: the huge Chat and the flash-patched Redstart.

Wingbars are the fast first cut. See two clean pale bars on the wing and you're down to three birds — Yellow-rumped, Townsend's, or Black-throated Gray. See none and you're in the yellow-warbler crowd, where the face does the work.
02

Walk it down

Tap through to a name. Cleanest on a bright spring bird.

The full key — follow the arrows.

1
Two clean pale wingbars; grey/black/white with yellow accents → go to 2
No wingbars; mostly yellow or olive → go to 3
A heavy-billed spectacled skulker, or a bird flashing orange/yellow in wings & tail → go to 5
2
Yellow rump + yellow side-patches; grey overall → Yellow-rumped Warbler
Bright yellow face & breast with a dark cheek-patch; black throat (male) → Townsend's Warbler
Crisp black-white face, black throat; only a tiny yellow spot before the eye → Black-throated Gray Warbler
3
Neat black cap on a bright yellow bird; plain beady face → Wilson's Warbler
Bold COMPLETE white eye-ring on a grey head; yellow below → go to 4
Grey hood over yellow belly; BROKEN white eye-arcs; grey throat → MacGillivray's Warbler
Broad black mask (male); yellow throat; skulks low in marsh → Common Yellowthroat
Drab olive-yellow, faint blurry streaks, almost no face pattern → Orange-crowned Warbler
Bright yellow head-to-tail; big dark eye; (male) chestnut breast streaks → Yellow Warbler
4
Extensively yellow underparts; clean grey head → Nashville Warbler
Mostly grey; small yellow breast-patch + yellow undertail; tail-wags → Virginia's Warbler
5
Big, heavy-billed, bold white spectacles; skulks & chatters → Yellow-breasted Chat
Flashes orange (male) or yellow (female) in wings & a fanned tail → American Redstart
03

Read the face

Among the plain-winged yellow crew, the face is the whole game.

Bold eye-ring
Complete white ring on a grey head — Nashville, Virginia's
Broken arcs
Split ring + grey hood, grey throat — MacGillivray's
Black cap
Bright yellow, plain beady face — Wilson's
Black mask
Male; yellow throat, marsh skulker — Common Yellowthroat
The two with no help: a bright plain-faced yellow bird with a big dark eye is Yellow Warbler (male shows chestnut breast streaks); a dingy olive bird with a faint split eye-arc and blurry streaks and nothing else is Orange-crowned — "the absence of field marks" is the field mark. The wing-barred trio sort on the face too: Townsend's yellow face + dark cheek, Black-throated Gray black-and-white with one yellow lore dot.
04

The players

Ordered common → rare. Amber box = the clinching (bright-plumage) mark.

Yellow Warbler

Setophaga aestiva

plain
ClincherThe whole bird glows yellow, head to tail; a big dark eye on a plain face; male adds fine chestnut breast streaks. Tail spots are yellow, not white.
Colour: all-yellowFace: plainMay–Aug breeder

Riparian willows and streamside thickets. The plain yellow face and yellow tail-spots separate it from the drab Orange-crowned and the black-capped Wilson's (see pairs).

Common · 36% at peak (May)

Yellow-rumped Warbler

Setophaga coronata

barred
ClincherGrey, black and white with a butter-yellow rump, yellow side-patches, and two white wingbars. "Audubon's" shows a yellow throat; "Myrtle" a white throat and white eyebrow.
Wingbars: twoRump: yellowFall–spring

Our default migrant and wintering warbler, often in loose flocks. The yellow rump ("butter-butt") shows in every plumage; Audubon's vs Myrtle is a tidy sub-ID.

Common · 36% at peak (Oct)

MacGillivray's Warbler

Geothlypis tolmiei

plain
ClincherA slate-grey hood wrapping the whole head and throat over a yellow belly, with bold broken white eye-arcs (above and below, not a full ring). No wingbars.
Face: grey hoodRing: brokenMay–Sep breeder

Skulks low in brushy tangles and regrowth. Broken arcs and a grey throat separate it from the complete-ringed, yellow-throated Nashville (see pairs).

Fairly common · 13% at peak (Jul)

Wilson's Warbler

Cardellina pusilla

plain
ClincherA bright lemon-yellow bird with a neat round black cap (male) and a plain, beady-eyed face; olive above, no wingbars.
Cap: blackFace: plainMigration (esp. fall)

Active and tail-flicking in willows and thickets. The cap is unmistakable on males; plain females are told from Yellow by the lack of chestnut streaks and a beadier look.

Fairly common · 12% at peak (Sep)

Orange-crowned Warbler

Leiothlypis celata

plain
ClincherThe drabbest warbler: dingy olive-yellow, faint blurry breast streaks, a faint split eye-arc and eyeline, and essentially no bold mark. The orange crown is almost never visible.
Colour: drab oliveFace: faintMigration

"The absence of field marks is the field mark." Note the yellow undertail and faint streaking — the hardest of the plain-winged crew, especially in fall (see pairs).

Fairly common · 12% at peak (Sep)

Nashville Warbler

Leiothlypis ruficapilla

plain
ClincherA clean grey head with a bold complete white eye-ring, a yellow throat and extensively yellow underparts, and an olive back. No wingbars.
Ring: completeHead: greyMigration

Migrant in scrub and woodland edges. Complete eye-ring + yellow throat separate it from MacGillivray's (broken arcs, grey throat) and the greyer Virginia's (see pairs).

Uncommon · 5.5% at peak (Sep)

Virginia's Warbler

Leiothlypis virginiae

plain
ClincherMostly grey with a white eye-ring, a small yellow breast-patch and yellow undertail coverts, a rufous crown-spot (often hidden), and a habit of tail-wagging.
Colour: grey+yellowRing: completeMay–Aug breeder

A dry-slope breeder in scrub oak and pinyon-juniper. Grey with only limited yellow separates it from the extensively-yellow Nashville (see pairs).

Uncommon · 4.7% at peak (May)

Townsend's Warbler

Setophaga townsendi

barred
ClincherA striking yellow face crossed by a dark cheek-patch and crown, a black throat (male), yellow breast, streaked flanks, and two white wingbars.
Wingbars: twoFace: yellow+darkMigration

A conifer migrant. The yellow face with a dark ear-patch separates it from the black-and-white Black-throated Gray (see pairs).

Uncommon · 4.2% at peak (Sep)

Black-throated Gray Warbler

Setophaga nigrescens

barred
ClincherCrisp black, grey and white: a black throat (male), bold white eyebrow and cheek-crescent, two white wingbars, and a single tiny yellow spot before the eye.
Wingbars: twoFace: black-whiteMay–Aug breeder

Breeds in scrub oak and pinyon-juniper. Almost no yellow — just the lore dot — which separates it from the yellow-faced Townsend's (see pairs).

Uncommon · 3.9% at peak (May)

Common Yellowthroat

Geothlypis trichas

plain
ClincherMale: a broad black mask bordered white above, a bright yellow throat and breast, a brownish body; skulks and "witchety"-sings low in marsh.
Face: black maskHabitat: marshSummer

Cattails and wet edges. The mask is diagnostic on males; plain females show a yellow throat and warm face — habitat and skulking behaviour help.

Scarce · 2.9% at peak (May)

Yellow-breasted Chat

Icteria virens

odd
ClincherHuge for a "warbler", with a heavy bill, bold white spectacles, a brilliant yellow breast, and a bizarre chattering, whistling song from dense thickets.
Size: very largeFace: spectaclesSummer thickets

Not a true warbler (its own family, Icteriidae). Big size, thick bill and white spectacles are unmistakable — more often heard than seen in riparian tangles.

Scarce · 2.4% at peak (Jun)

American Redstart

Setophaga ruticilla

odd
ClincherConstantly fans its tail to flash patches — orange (adult male, on black) or yellow (female/immature, on grey-olive) — in the wings and tail sides.
Pattern: flash-patchesBehaviour: tail-fanScarce migrant/breeder

A scarce, local riparian breeder and migrant. The flashing wing-and-tail patches and constant tail-fanning are unlike anything else here.

Rare/very local · 0.6% at peak (Aug)
05

The ones that fool you

Bright-bird pairs; the fall drabs are their own problem (§06).

Orange-crowned vs Yellow

Both plain-winged and yellowish. Yellow is bright and clean with a big dark eye and yellow tail-spots; Orange-crowned is dingy and olive with faint blurry streaks and a faint split eye-arc. If it looks washed-out and marks-free, it's Orange-crowned.

Nashville vs MacGillivray's

Both grey-headed and yellow-bellied. Nashville has a complete bold eye-ring and a yellow throat; MacGillivray's has broken white arcs and a grey hood that includes the throat. Throat colour alone often settles it.

Nashville vs Virginia's

Both grey-headed with a white eye-ring. Nashville is extensively yellow below; Virginia's is mostly grey with just a yellow breast-patch and yellow undertail, and it wags its tail. Extent of yellow is the cut.

Townsend's vs Black-throated Gray

Both wing-barred with a black throat (male). Townsend's has a yellow face and breast with a dark cheek; Black-throated Gray is black, grey and white with no yellow but a single tiny lore dot.

Wilson's vs Yellow

Both bright yellow and plain-winged. Male Wilson's wears a neat black cap; Yellow shows chestnut breast streaks (male) and yellow tail-spots. Capless females: Wilson's is beadier-eyed and greener above.

MacGillivray's vs Common Yellowthroat

Both dark-faced skulkers. MacGillivray's shows a grey hood with broken white arcs in brushy uplands; male Yellowthroat has a solid black mask and lives in marsh. Females: go by structure and habitat.

06

Don't import these

The fall ceiling, the chase-birds, and the vagrants.

First, the honest limit: fall & immature warblers

Everything above keys cleanest on a bright spring bird. September immatures — washed-out Orange-crowned, dull first-fall Yellow-rumped, greenish young Wilson's and Nashville — lose their marks and genuinely overlap. Get the wingbar state, the face remnants, and the undertail, then reach for a dedicated reference (Dunn & Garrett, Warblers). Don't force a drab bird to a species because the key wanted one.

Beware chase-inflated numbers

A few eastern vagrants show all-years peak frequencies near 1% — Hooded ~1.5%, Canada ~1.1%, Black-throated Blue ~1.0%, Chestnut-sided ~0.9%. Those aren't regular occurrence; they're single staked-out birds that many people chased in one week. Treat every one as a rarity, not a tier.

Source disagreement — verify before you claim

eBird shows these in the county; the 2020 UBRC checklist lists them as not recorded and review species.

  • Hooded Warbler, Chestnut-sided Warbler — eBird has records (the chase-birds above), but neither is on the 2020 list. Document, don't assume.

Recorded, but review species — a Merlin ID isn't proof

These have occurred but the UBRC requests documentation. The likely-to-appear ones:

  • Northern Parula, Magnolia, Cape May, Black-throated Blue, Palm, Bay-breasted, Blackpoll, Ovenbird, Canada review — eastern strays, mostly fall. Photograph and report.

Not on the county list (2020) — a county first if real

  • Golden-winged, Blue-winged, Black-throated Green, Pine, Prairie, Kentucky, Louisiana Waterthrush, Painted Redstart review · not recorded — none on the 2020 list; any is a records-committee bird.

Not vagrants — just uncommon regulars I left off the cards

Reported and not review, so they belong on your list — they're simply too scarce or too distinct to card here:

  • Tennessee (drab, Vireo-like), Black-and-white (creeps trunks like a nuthatch), Northern Waterthrush (streaked, tail-bobbing, terrestrial). Uncommon migrants — expected, just not part of the yellow-warbler ID knot.