Captive breeding and reintroduction programs of threatened amphibian populations is an important conservation management strategy. These programs have the potential to prevent extinction of at-risk species and to help maintain genetic diversity. However, frogs reared in captivity develop in an aqueous environment that differs microbially and chemically from natural systems and may consume atypical food compared to natural resources available at release sites. It is unclear how or if this captive environment influences the fitness and survival of these individuals when they are reintroduced into the wild. The Sierra Nevada yellow-legged frog (Rana sierrae) is an endangered species endemic to California. In 2022, the US Forest Service in collaboration with the San Franscisco Zoo, released 164 captive-reared frogs into known critical habitat for a population of R. sierrae as part of a long-term monitoring and mark recapture study. One year post-release, we use size, weight, and conditional indices of recaptured individuals to compare wild and zoo-reared frogs.