Rhacophorus helenae Rowley, Tran, Hoang, and Le, 2012 was recently described from is southern Vietnam, listed as Endangered in the IUCN Red List of Threatened Species (IUCN SSC Amphibian Specialist Group 2020). The larval morphology in stages 35, 37-39, 41 of this species was provided by Vassilieva et al., 2016. We describe the external morphology of the tadpoles of the species R. helenae collected from Dong Nai Culture and Nature Reserve, Dong Nai Province, Southern Vietnam. The morphology of 23 tadpole specimens (Gosner stages 26, 28, 29, 32, 34, 35, 39, 41, and 43) of this species are also provided. We provide an updated development stage and discussion of the tadpole morphology different of the genus Rhacophorus.