Volcano Junco is resident in the highlands of Costa Rica and western Panama. It occurs on the Irazú-Turrialba massif in the eastern portion of the Cordillera Central of Costa Rica, and from there south through the Cordillera de Talamanca, to Volcán Barú in Chiriquí, western Panama (Wetmore et al. 1984, Stiles and Skutch 1989).
Volcano Junco primarily occurs above 3000 m, but there is an isolated population at 2100 m in Sabana Dúrika in Costa Rica, and locally it occurs down to 2600 m, in the wake of deforestation (Wetmore et al. 1984, Stiles and Skutch 1989).