Leaves turning yellow in autumn, or yellow autumn foliage; the yellowing of leaves.
山の黄葉が見頃を迎え、たくさんの観光客が訪れている。
The yellow foliage on the mountain is at its best, and many tourists are visiting.
庭のイチョウの黄葉は例年より早く始まった。
The gingko's yellowing in the garden started earlier than usual this year.
黄葉と紅葉はともに秋の風物詩だが、色や時期が樹種で異なる。
Both yellowing and reddening of leaves are autumnal features, but the colors and timing vary by species.