The dorsum has grayish to orange brown background color and is marked with varied darker spots and blotches.

The venter has brown spots or reticulations (this species was originally named as P. reticulatus in reference to the latter).

[2] Platymantis isarog is an arboreal frog that occurs in mossy and montane rainforests at elevations of 650–1,800 m (2,130–5,910 ft) above sea level.

There is geothermal power generation on the slopes of Mount Malinao, but its impact is limited.

Thus, despite its limited distribution, this species is not considered threatened by the IUCN SSC Amphibian Specialist Group.