The skin of dorsum and venter is smooth and with dark gray, reddish-brown, or dark gray-brown ground colour.

The flanks are yellowish brown to dull yellow with an orange suffusion ventrally.

[4] Eggs are large and yellow, up to 4 mm (0.16 in) in diameter.

[4] Oreobates pereger is a terrestrial frog inhabiting montane cloud forests[1] at elevations of 1,600–2,900 m (5,200–9,500 ft) above sea level.

[3] It is threatened by habitat loss caused by agricultural expansion, wood collecting, and human settlement.