Bird Profile
Evening Grosbeak
A flock of Evening Grosbeaks can strip a feeder in a morning, and then not return for four years. Here is how to recognize them, and how to be ready when they come.
The short answer
- The male is unmistakable: dull gold body, dark head with a broad yellow eyebrow, black wings with a huge white patch, and a pale conical bill big enough to crack a cherry pit.
- Evening Grosbeaks are irruptive, not migratory in the ordinary sense, so they appear far south of the boreal forest in some winters and are absent for several years running.
- Sunflower is the whole strategy: black oil or striped sunflower on a large open surface, offered in volume.
- A flock of 20 birds will empty a small tube feeder daily, so plan on a platform with real capacity rather than refilling four times a day.
- Long-term survey data show a steep continental decline since 1970, one of the sharpest of any widespread North American songbird.
- Flocks feed shoulder to shoulder in one place, which makes feeder hygiene more important than usual.
At a glance
- Scientific name
- Coccothraustes vespertinus
- Length
- 6.3 to 8.7 in (16 to 22 cm)
- Wingspan
- 11.8 to 14.2 in (30 to 36 cm)
- Weight
- 1.9 to 2.6 oz (53 to 74 g)
- Range
- Boreal Canada, northern New England and Great Lakes, western mountains south to Mexico. Irruptive in winter.
- Favorite foods
- Black oil sunflower, striped sunflower, sunflower hearts
- Best feeder
- Large platform or tray, or a high-capacity hopper
- At feeders
- Late fall through early spring, in irruption years only
The Evening Grosbeak is a chunky, short-tailed finch about the size of a starling, built around a pale conical bill so oversized it looks borrowed from a larger bird. Males are dull gold and olive with a dark head, a broad yellow brow stripe, and black wings carrying a white patch you can see across a field. Females are gray with a yellow wash on the neck and flanks, and the same startling bill.
They are also the least predictable bird on this site. Evening Grosbeaks do not migrate on a schedule. They move in response to the conifer and maple seed crop of the boreal forest, which means a yard in Pennsylvania or Ohio might host 40 of them one January and none for the next five years. When they do arrive, they arrive as a flock, and the amount of sunflower seed they can move through is genuinely surprising.
This profile covers how to separate them from the other big yellow and black birds people confuse them with, what irruption years actually mean for your feeder, the seed and hardware a flock will use, and the sobering population picture behind a bird that used to be a routine winter visitor across the northern United States.
How to identify an Evening Grosbeak#
Start with the bill. It is thick, conical, and pale: bone or ivory in fall and winter, turning a distinct pale green as the breeding season approaches. Nothing else at a North American feeder has a bill of that size in that color. It is a seed crusher powerful enough to open cherry and olive pits, which is why the birds handle sunflower hulls almost carelessly.
The adult male is dusky brown on the head, shading into gold on the belly and rump, with a thick yellow stripe running back over each eye like a brow. The wings are black with a large, clean white secondary patch. In flight, the flock flashes black and white, then lands and turns gold.
The female is a subtler bird: brownish gray overall with a yellow-green tinge to the neck and sides, white patches in black wings, and white spots in the tail. Immature birds resemble females. In a mixed flock, most of what you see at a distance is a shifting mass of black, white and dull yellow.
The voice is the other giveaway. Evening Grosbeaks have no real song, just a loud, ringing, slightly burry call often written as cleer or peer, given constantly in flight. If you learn one sound from this page, learn that one: it is usually how a flock announces itself before anyone looks up.
Confusion species
| Bird | Why it gets confused | How to separate it |
|---|---|---|
| American Goldfinch | Yellow finch, black wings with white | Half the size, tiny orange or pinkish bill, no brow stripe |
| Western Tanager | Yellow body, black wings, white wing bars | Slim body, orange-red face in males, thin gray bill, summer only |
| Pine Grosbeak | Same shape, same flocks, northern finch | Rosy pink or gray, not yellow, with a small dark curved bill |
| Black-headed Grosbeak | Big bill, black and orange male | Orange-cinnamon below, not gold; western summer bird |
| Common Grackle | Similar size in silhouette | Long keeled tail, dark all over, long pointed bill |
In practice, the split that trips people up most is Evening Grosbeak against a bright male American Goldfinch in fresh spring plumage. Size settles it instantly if you can see both, and the bill settles it if you cannot. There is more on sorting northern finches in the finch identification guide.
Where and when Evening Grosbeaks show up#
The breeding range covers the boreal forest across Canada, dipping into northern New England, the Adirondacks, the upper Great Lakes, and running south down the western mountains through the Rockies and Sierra Nevada into Mexico. In the West, birds may be present year-round at elevation and simply move downslope in winter. Feeder watchers in the Mountain West and the Pacific Northwest see them more reliably than anyone in the East.
East of the Rockies, the pattern is different. A yard in the Northeast or the Midwest gets Evening Grosbeaks as a winter event, not a season. Birds appear between late October and December and may stay into April, or may pass through in a week. Across the border, feeders in southern Canada sit closer to the source and see them more often.
The trigger is food supply. Evening Grosbeaks depend heavily on the seeds of conifers, box elder, ash and maple, and on outbreaks of spruce budworm, which they eat in enormous numbers during infestations. When the northern seed crop fails, flocks push south. When it is good, they stay put and southern feeders see nothing.
Irruption is about food, not cold
Southbound movements of Evening Grosbeaks track the failure of northern tree seed crops, not the severity of the winter. A brutal cold snap in your yard does not summon them, and a mild December does not rule them out.
Understanding irruption years honestly#
Every fall, forecasts circulate about which northern finches will move south. They are informed guesses built on reports of cone and berry crops across the boreal forest, and they are useful, but they are not schedules. A forecast that says grosbeaks will move into the Great Lakes does not mean your yard specifically. Flocks are patchy: one town gets 50 birds, the next town over gets none.
Two honest points are worth stating. First, historical accounts describe Evening Grosbeaks irrupting into the eastern United States on a rough two-year rhythm through the middle of the twentieth century, and that pattern weakened as the population fell. Second, nobody can tell you the odds for your address. If you feed in the northern tier of states, treat a grosbeak flock as a windfall you keep a feeder ready for, not an event you plan around.
The practical response is simple: keep sunflower in a large open feeder from November through March, watch what other feeders in your area are reporting, and be willing to buy seed in a hurry if a flock lands. The seasonal feeding calendar covers the rest of the winter schedule.
What Evening Grosbeaks eat#
Away from feeders, the diet is dominated by tree seeds and buds: spruce, fir and pine seeds, box elder and maple samaras, ash keys, and the buds of maples in late winter. They take berries, including juniper and cherry, and crack the pits for the kernel. During spruce budworm outbreaks they switch heavily to caterpillars, and breeding success rises with them.
At a feeder, the picture is much simpler. They want sunflower.
| Food | Grosbeak response | Notes |
|---|---|---|
| Black oil sunflower | Top choice | Eaten in the shell, fast; the default offering |
| Striped sunflower | Excellent | Thick hull is nothing to this bill and it slows small birds down |
| Sunflower hearts | Taken eagerly | Less mess, higher cost, spoils faster when wet |
| Cracked corn | Occasionally taken | Not a draw on its own |
| Safflower | Sometimes taken | Reports vary; do not rely on it |
| Nyjer | Largely ignored | Wrong scale of seed for this bill |
| Suet | Rarely taken | Not part of the normal feeder diet |
Striped sunflower deserves a mention because the usual argument against it, that most feeder birds struggle with the hull, does not apply here. If you want a seed that grosbeaks handle easily and House Sparrows do not, it is a reasonable choice. Otherwise black oil sunflower is the straightforward answer.
The feeder setup Evening Grosbeaks actually use#
These are heavy, broad-bodied birds that feed as a group and want to stand still while they crack seed. That points at one thing: a large flat surface.
- A big platform or tray feeder is the single best choice. Ten or more birds can feed at once, which matters because the flock arrives together.
- A hopper feeder with a wide ledge works, but check the capacity honestly: many hold a day of grosbeak feeding, not a week.
- Tube feeders are a poor fit. Grosbeaks can use ports with a bottom tray attached, but they crowd and squabble on short perches.
- Ground feeding picks up the substantial spill from a busy platform. They forage on the ground readily.
- Seed on a deck rail or a cleared patch of driveway works. This is not a fussy bird about furniture, only about surface area.
Height is not critical. Somewhere between 4 and 6 feet (1.2 to 1.8 m) keeps the feeder workable for you and out of the way of ground predators, and the general rules in feeder height apply. What matters more is drainage: an open tray of sunflower in a Great Lakes February collects snow, and wet seed under a flock is a health problem waiting to happen.
Budget for the seed before you commit
A flock of Evening Grosbeaks can go through several pounds of sunflower a day. If you cannot sustain that, offer what you can and stop when you need to rather than putting out cheap filler mixes; the birds are not dependent on you, but moldy or unsuitable seed does real harm. See how much seed you need and storing bird seed.
Behavior worth knowing#
Flocking is the defining trait. Outside the breeding season Evening Grosbeaks travel in tight groups, often 10 to 50 birds, occasionally many more. They land in a treetop together, call, drop to the feeder together, and leave together. A yard can go from empty to loud in fifteen seconds.
They are noisy but not especially aggressive toward other species. Small birds simply get displaced by bulk. Expect chickadees and nuthatches to work the edges of the tray and grab a seed between grosbeak visits.
Grit and salt draw them strongly. Evening Grosbeaks come to gravel roads, mineral licks and roadside salt in winter, which is one of the documented hazards for the species: birds feeding on road salt get hit by vehicles. If you want to offer minerals safely, keep it in the yard rather than at the roadside, as covered in grit and calcium.
They also drink and bathe often, and will use open water in cold weather. A heated bath is a genuine draw in an irruption winter; see winter water.
Nesting#
Nesting is the least understood part of this bird's life. Evening Grosbeaks breed in conifer and mixed forest across the boreal zone and western mountains, building a loose, flimsy cup of twigs lined with fine rootlets and needles, usually high in a conifer and hard to find. Nests are sparsely reported for such a familiar bird.
Clutches are typically 2 to 5 eggs, blue-green with darker blotches. The female incubates for roughly two weeks while the male brings food, and both parents feed the young, which leave the nest around two weeks after hatching. Pairs may nest in loose association with others rather than defending large exclusive territories, which fits their sociable temperament.
They do not use nest boxes, and there is no housing you can offer. If you live within the breeding range, mature conifers and an unsprayed yard are the contribution that matters.
Population and conservation#
This is the part of the page that matters most. Evening Grosbeaks were a common winter feeder bird across the northern and eastern United States through the middle of the twentieth century, and they are not anymore. Long-term monitoring, including Breeding Bird Survey data and decades of feeder counts, shows a steep continental decline since 1970, on the order of 90 percent. It is one of the largest documented declines of any widespread North American landbird, and the species is flagged for concern in continental conservation assessments.
The causes are not fully resolved. Contributing factors that researchers point to include changes in spruce budworm outbreak dynamics and the forest management that suppresses them, logging of mature conifer forest, collisions with windows and vehicles, and disease. Salmonellosis has hit finch flocks hard in some winters, and Evening Grosbeaks are among the affected species.
Two things you control are worth doing. Treat window collisions seriously, because these birds fly fast in flocks and hit glass: see preventing window strikes. And keep the feeder clean, because a crowded tray is exactly the setting that spreads salmonella. A hard scrub and disinfection on the schedule in cleaning frequency is not optional when a flock is present.
If birds look sick, take the feeders down
Fluffed, lethargic birds that will not flush, or dead birds under the feeder, mean you stop feeding, clean everything, and wait a couple of weeks. The guidance is in what to do about a sick bird at your feeder. Bird welfare outranks your enjoyment of the flock.
An Evening Grosbeak setup that works#
- A large platform or tray feeder with drainage, kept filled with black oil or striped sunflower from November through March.
- A second surface, a ground tray or a cleared spot below, to absorb the overflow when a flock lands.
- Seed capacity you can actually sustain, plus a plan for buying more in a hurry.
- Open water, heated if your winters freeze.
- Window treatment on the glass nearest the feeder, applied outside where it works.
- A cleaning routine you keep to while the flock is around, not after it leaves.
Frequently asked questions#
Why do Evening Grosbeaks only show up some years?
They are irruptive. Their winter movements track the seed crop of northern conifers, box elder, ash and maple rather than temperature. In years when the northern crop fails, flocks push far south; in good seed years they stay north and southern feeders see none. Forecasts based on cone crop reports are useful but cannot predict any individual yard.
What is the best food for Evening Grosbeaks?
Sunflower, in volume. Black oil sunflower is the reliable default and striped sunflower works just as well because their bill handles the thick hull easily. Sunflower hearts are taken eagerly but cost more and spoil faster. Nyjer and suet are largely ignored. Offer it on a large flat surface rather than through small tube ports.
How many Evening Grosbeaks come at once?
Winter flocks are usually 10 to 50 birds, though larger groups occur. They arrive and leave as a unit, so a feeder can go from quiet to full in seconds. Plan feeder capacity for the flock rather than for individual birds, or you will be refilling several times a day.
Are Evening Grosbeaks endangered?
They carry no federal endangered listing, but the population trend is alarming. Long-term survey data show a decline on the order of 90 percent since 1970, and the species is flagged in continental conservation assessments as a common bird in steep decline. Suspected drivers include forest change, budworm outbreak dynamics, collisions and disease.
Do Evening Grosbeaks use nest boxes?
No. They are open-cup nesters that build a loose twig platform high in a conifer, and no box design will attract them. If you live in their breeding range, mature conifers, no pesticide use and open water are the useful contributions.
Why is the grosbeak's bill a different color in spring?
The bill of adults shifts from bone or ivory in fall and winter to a distinct pale green as the breeding season approaches. It is a seasonal change in the bill sheath, not a sign of a different species or an unhealthy bird.