It is endemic to Papua New Guinea where it is known from the northern coast between the tip of the Huon Peninsula and south and east to Kokoda and Popondetta.

[3] The male advertisement call is "harsh" with rapidly repeated notes.

[3] Oreophryne geislerorum occurs in rainforests, rural gardens, and urban areas at elevations up to about 1,400 m (4,600 ft) above sea level[1] Active by night, males call from shrubs and trees, sometimes high up.

They have been observed to lay eggs inside the stalk of a banana leaf near the main stem.

[1] Oreophryne geislerorum is a very common, adaptable species that is not facing any known threats.