Since Nez Perce National Historical Park is mostly a semi-arid environment, the diversity of amphibians is low, but four species, the long-toes salamander (Ambystoma macrodactylum), western toad (Bufo boreas), Pacific treefrog (Hyla regilla), and American bullfrog (Rana catebeiana) were confirmed during a 2002 inventory. The western toad was found most frequently across all of the park sites that were sampled and is considered a sensitive species by the Bureau of Land Management (BLM) and species of special concern by the Idaho Department of Fish and Game (IDFG). Sensitive species are defined as those identified by national authorities for which population viability is a concern as evidenced by: (a) significant occurrence or predicted downward trends in population numbers or density, and/or (b) significant current or predicted downward trend in habitat capability that would reduce a species' existing distribution.
The nonnative, invasive American bullfrog had the second highest abundance. The discovery of so many bullfrogs along the length of Jim Ford Creek at the Weippe Prairie site presents a challenge to managing this site for native animal species.