The detection of white-nose syndrome (WNS) in King County, WA in 2016 prompted the National Park Service to mobilize region-wide bat monitoring and disease surveillance. One of the goals of the Pacific West Region WNS response plan was to implement acoustic monitoring to determine the distribution of bat species and evaluate changes in distribution as WNS spreads. From May to September 2019, we conducted acoustic monitoring at 61 unique sites at two North Coast and Cascades Network (NCCN) parks, Mount Rainier National Park and North Cascades National Park Service Complex). We report results from one of seven elevational transects, Nisqually to Paradise at Mount Rainier National Park. We detected 8 of 11 species known to western Washington. We also detected more bat calls and
higher species diversity in riparian habitats compared to forest openings.