Estimates of 2018 abundance and overwinter survival rates for captive-reared Rana sierrae released in 2017 in the South Fork (SF) Rock Creek reaches. Demographic parameter estimates are model averages from Huggins robust design models. Est = estimate; SE = standard error; CI = confidence interval. Number of frogs released in 2017 were 3 female, 8 male in SF Tributary 1 and 6 female, 5 male in SF Tributary 2. Number of frogs released in 2018 was 11 female, 9 male in SF Main Channel; 12 female, 8 male in SF Tributary 1; and 12 female, 8 male in SF Tributary 2.