Wildfires can have large and direct impacts on ecosystems; however, little is known about how fish respond to wildfires, especially in remote wilderness settings. Research has shown that invertebrate productivity can benefit from wildfires in wilderness settings, that this pulse of productivity can extends to fish after fire, and that wildfire is an essential factor in the maintenance of native biodiversity. Big Creek, located in the wilderness of central Idaho, USA, recently experienced a large fire during the summer of 2025. This fire follows several major fires since the late 1980’s. Fish abundance surveys have been conducted at various points during this period, preceding the 2025 wildfire. We are taking advantage of this circumstance to repeat these abundance surveys using a Before-After-Impact-Control (BACI) study design. Sites surveyed that burned will be resurveyed to collect post-fire data, and sites that did not burn will also be resampled for comparison. Our aim is to determine if the high-severity fire in 2025 influenced fish populations residing in Big Creek and its tributaries. Further, at a subset of sites that have burned repeatedly over the period of monitoring, we will be able to assess responses to a series of wildfires. Therefore, results from this investigation, combined with long-term monitoring conducted in the area, may not only reveal short-term responses to wildfire, but also the consequences for fish populations as the result of a shifting fire regime.