It is endemic to Borneo and is, as currently defined, found in Kalimantan (Indonesia), Sabah and Sarawak (Malaysia), and Labi, Belait (Brunei).

[2] The holotype of Leptobrachium montanum is an adult female measuring 63 mm (2.5 in) in snout–vent length (SVL).

[5] This lineage from southeastern Kalimantan is believed to represent the "true" Leptobrachium montanum.

[4] Its natural habitats are submontane and montane forests at elevations of 900–1,800 m (3,000–5,900 ft) above sea level.

[1][4] While adults and juveniles can roam widely through forests,[1] breeding takes place in small to medium-sized mountain streams with rocky stream bed.