The male is the only small, yellow bird with black wings and tail, with flight that is extremely undulating. In winter the species concentrate in areas where seed-laden plants are common.

They breed from Canada to Mexico and winter in the same range, nesting in July and August, after most birds have finished. The song is long-sustained, clear, light, and canary-like. In its flight, each dip is often punctuated by a simple cry of ti-dee-di-di.

Goldfinches are found along hedgerows, wood margins, brushy fields, and flower gardens, especially where cosmos are growing.