This junco breeds above the timberline, typically at altitudes above 3,000 m, but there is an isolated population at 2,100 m on the Caribbean slope of Costa Rica and forest clearance on Cerro de la Muerte has allowed this species to descend to 2,600 m. The habitat is open grassy or brushy areas with some stunted scrubs.

The nest is a neat, lined cup constructed on the ground under a log, bush or rock, or in a cavity on a vegetated bank.

The volcano junco is on average 16 cm long and weighs 28 g. The adult has brown upperparts with dark streaking especially on the back.

The sides of the head are grey with a black mask through the eye, a yellow iris, and a pink bill and legs.

The volcano junco feeds on the ground on seeds, fallen berries, insects and spiders.