American Goldfinch: the bird that changes clothes, not addresses

The short answer

• Goldfinches molt their body feathers twice a year and spend the winter in drab olive-buff plumage, which is why people think they migrate away.
• Nyjer and sunflower hearts are both top-tier foods for them. Black oil sunflower works too, and cracked corn, peanuts and mealworms do not.
• They nest later than almost any other North American songbird, mostly late June to August, timed to seed and plant down rather than to insects.
• The commonest reason a finch feeder is ignored is stale nyjer. Test it by pinching a seed: fresh nyjer is oily inside, stale nyjer is dry and hollow.
• Winter flocks of 20 or more concentrate birds at one feeder, so cleaning is a disease issue rather than a tidiness issue.

Every October the same message arrives: the goldfinches have gone. They have not. American Goldfinches are the only North American finch that molts its entire body plumage twice a year, and the bird that shows up at the nyjer feeder in November is the same bird that was glowing yellow in July, wearing different feathers.

The molt, and why nobody recognizes the result#

In late summer, roughly August into September, every body feather is replaced. The male loses his lemon yellow and his black forehead and turns olive-brown above, buff below, with a hint of warm yellow at the throat. The female changes less but goes grayer and duller. Both keep black wings with buff or white wingbars, which is the one thing that carries through the year.

Even the bill changes. In breeding condition it is bright orange-pink. By November it is a dull gray-pink. If you have wondered why a winter finch at your feeder looks like it has the wrong beak, that is why.

In late winter, from about late February into April, the body feathers are replaced again and the yellow returns. That intermediate stage is worth watching for: patchy males, blotched yellow and brown, looking moth-eaten for two or three weeks in March. Nothing is wrong with them.

Sorting it from the birds it gets confused with#

Winter is when the mistakes happen.

The undertail is a genuinely useful check in the West, where both goldfinches occur: American Goldfinch has white undertail coverts, Lesser Goldfinch has yellow ones, in every plumage.

Flight and voice give them away before the plumage does. Goldfinches fly in deep bounding undulations and call on each rise, a bright four-note phrase that most people learn as po-ta-to-chip.

Nesting in August#

Goldfinches are among the latest nesters of any North American songbird. Pairs form in spring and then wait. Most first clutches go down between late June and August.

The reason is dietary. This is a strict seed eater, and it feeds its nestlings regurgitated seed rather than caterpillars, so there is no advantage in matching the spring insect flush. What it needs instead is mature composite seed, thistle, milkweed and their relatives, both as food and as the fine down that lines the nest cup. The nest is a tight, deep cup, dense enough to hold water in a downpour.

For your feeder this means the quiet stretch is July and early August, when adults are on nests and natural seed is everywhere, and the busy stretch starts again in late August when short-tailed juveniles arrive with the adults. If you are managing a yard through this period, the wider guidance is in feeding during nesting season, and leaving seedheads standing is covered in native plants and cover.

What a goldfinch flock does to a feeder#

Goldfinches come in numbers. Winter flocks of 20 to 40 are ordinary, and they arrive as a group, settle for ten to twenty minutes, and leave as a group. Between visits the feeder can sit empty for an hour, which is why people conclude the birds have left when they have simply gone to the next yard on the circuit.

At the feeder itself:

• They cling. Perch length is irrelevant to them. They will feed head-down, sideways, or off a mesh sock with no perch at all.
• They do not cache. Everything taken is eaten there.
• They are low in the pecking order but persistent. House Finches and siskins displace individuals constantly, yet the flock as a whole holds the feeder.
• They drink a lot. A dry seed diet means heavy water use, and a shallow bird bath will often out-pull the feeder in summer.
• Peak activity is mid-morning and again two hours before dusk, which is later than the dawn-first pattern of chickadees and woodpeckers.

Putting out the right thing#

Skip for this species: Cracked corn, Peanuts (in shell), Mealworms, Nectar, Fruit / jelly.

Two workable setups, depending on what else visits:

1. A nyjer tube or mesh feeder with nyjer seed. The specialist option. Narrow slit ports, a third full at a time, emptied and cleaned every two weeks. If you are choosing between formats, see nyjer sock versus nyjer tube and the design notes in finch feeders.
2. A standard tube of sunflower hearts. Rated just as highly by goldfinches, eaten by everything else in the yard, no hulls on the ground, and cheaper per calorie actually eaten than nyjer.

If you want goldfinches close to the house, they are one of the few species that take to a window feeder readily, because a flock feels safe in a way a lone bird does not.

A full feeder and no finches#

Run this list in order.

1. Stale nyjer. The overwhelming favorite. Pinch a seed: oily and pale inside is fine, dusty and hollow is not. Nyjer that has sat in a warm shed since last winter is not food. Buy six weeks at a time and keep it as described in storing birdseed.
2. Wet, clumped seed at the base of the tube. Nyjer sets into a plug faster than sunflower. The feeder looks full and delivers nothing.
3. A dirty feeder and a sick flock. Finch flocks concentrate birds and spread disease. Sudden abandonment, or a fluffed bird sitting still on the perch, means take the feeder down and read bird diseases at feeders before refilling. The cleaning routine is in how to clean a bird feeder.
4. Natural food glut. In late summer and early autumn, coneflower, goldenrod and thistle seedheads outcompete anything you can offer. Wait three weeks.
5. Port and seed mismatch. Nyjer pours straight through a sunflower port. Sunflower jams a nyjer slit. One seed, one feeder.
6. The flock is somewhere else on its circuit. Watch at three different times of day before deciding you have no goldfinches.

The goldfinch year#

• January and February. Peak flock size, drab plumage, heaviest nyjer use of the year.
• March. Patchy molting males. Song starts. Numbers still high.
• April and May. Full breeding yellow. Flocks break into pairs and feeder counts often drop, which is normal and temporary.
• June. Pairs present, no nests yet in most of the range.
• Late June to August. Nesting. The quietest feeder weeks of the year.
• Late August and September. Juveniles arrive, adults begin molting, numbers climb again.
• October and November. The plumage change completes and the yard fills with birds people no longer recognize. Flocks re-form and settle into a winter routine.

Frequently asked questions#

Where do goldfinches go in the winter?

Mostly nowhere. American Goldfinches are present all year across most of the United States and southern Canada. What changes is the bird, not the address: in late summer they molt every body feather and come out olive-brown above and dull buff below, with only black wings and pale wingbars left as a clue. The bright bird disappears and a nondescript one takes its place at the same feeder. There is real movement as well, with northern birds shifting south, so the individuals at your feeder in January may not be the ones that nested nearby.

Why do goldfinches nest so late in the summer?

Because their young are raised on seeds rather than insects. Most songbirds time nesting to the spring caterpillar peak. Goldfinches wait for thistle, milkweed and other composites to set seed and produce down, then nest from late June into August, using the down to line the cup and regurgitated seed to feed the nestlings. One side effect is that Brown-headed Cowbird chicks laid in a goldfinch nest rarely survive, because a seed diet does not suit them.

What is the best food for American Goldfinches?

Nyjer and sunflower hearts, which both rate as top-tier favorites in our preference data. Nyjer is the specialist seed and suits a feeder with narrow slit ports. Sunflower hearts are cheaper per calorie eaten, are taken just as readily, and have the advantage that every other small bird in the yard eats them too. Black oil sunflower in the shell works if the birds can crack it, which they can. Skip corn, peanuts, mealworms and mixes heavy in millet.

Why are goldfinches not eating my nyjer?

Nine times out of ten the seed is stale. Nyjer is imported and heat-treated so it cannot germinate, and it dries out on the shelf and in your feeder. Pinch a seed between a fingernail and your thumb: fresh nyjer crushes to an oily, pale interior, and stale nyjer is dusty and hollow. Buy an amount you will use in about six weeks, store it cool and dry, and never fill the tube more than a third full in warm weather.

How do I keep House Finches off my nyjer feeder?

Use a feeder with the ports set below the perches so the bird has to feed hanging head-down. Goldfinches do this without hesitation, and House Finches usually will not persist at it. It is not absolute, and a determined House Finch will learn, but in practice it shifts the balance strongly. The other approach is simply more feeding stations, spaced 15 ft or more apart, so one flock cannot hold everything at once.

Sources and further reading

1. American Goldfinch Cornell Lab of Ornithology, All About Birds Molt, breeding timing and diet
2. Feeding Birds Cornell Lab of Ornithology, Project FeederWatch Nyjer and finch feeder guidance
3. Guide to North American Birds National Audubon Society Range and seasonal presence