Populations limited by availability of roost sites. Day roosts located in buildings, trees, under rocks or wood, or occasionally in caves. Night roosts located in similar sites, or even the same sites, but usually in more confined spaces. Temperatures usually warmer, as many bats pack into night roost. Lactating females may not use a night roost, which may be related to their use of heterothermy as an energy saving strategy.
Hibernation roosts in caves or mines.
Quick to locate new roosting sites, particularly during autumn dispersal. Nursery roosts usually in buildings, but also in other locations with suitable temperatures. Emerges at dusk. Activity peaks about 2.5 hr after dusk. Individuals may enter torpor daily in non-hibernating seasons.