Habitats occupied range from arid deserts and grasslands through mixed conifer forests. Moths are the principal food. There is some evidence of beetle consumption. Feeds in flight, over water, and near the ground, using echolocation to find prey. Occasionally found in caves and buildings.
Cliffs provide optimal roosting habitat.
Prefers sites with adequate roosting habitat, such as cliffs. Feeds over water and along washes. May move from forests to lowlands in autumn. Four individuals were observed hibernating together. Most births occur before mid-June.