Cascades frogs occur in Northern California and are a candidate species under the California Endangered Species Act due to declining populations from a variety of threats. Historically the Klamath Mountains have held large populations of Cascades frogs. However, in the Southern Cascades range, few extant populations exist and population numbers are generally low. We monitored one of the remaining robust populations in the Southern Cascades, which occurs at the southern extreme and lower elevational limits of its range. We intensively monitored the population using capture-mark-recapture techniques for 4 consecutive years. From 2018-2021, the population experienced variable climatic conditions, including a historically wet winter in 2018-2019 and record-setting drought in 2021. During this time, we have been able to assess habitat occupancy, population structure, and seasonal movements. This intensive data collection has allowed us to develop conservation actions to help maintain the population, and further adds to the overall knowledge of the species.