Altitudinal variation in larval growth and development rates in low-and high-altitude pop­ulations of two subtropical species of frog, Litoria chloris and Litoria pearsoniana was examfoed jn the field using reciprocal transplant experiments. The larvae of both species raised al high altitudes (regardless of tadpole origin) had slower development rates than larvae raised at low altitudes. Slower growth rates were found in larvae from high altitudes in L. chloris, whereas a similar (but not significant) trend was recorded in L. pearsoniana. Despite slower growth rates overall, tadpoles raised at high altitudes tended to be larger at each Cosner Development Stage than those raised at low altitudes independent of tadpole origin. These results suggest that most of the variation in growth and development rates in the two species was caused by environmental factors (water temperature) rather than genetic or maternal factors. Tadpole survival in either species did not appear to be significantly affected by environmental or genetic factors in this study.