Gleans from brush or trees or feeds along habitat edges. Peak activity is late in the evening preceded by flights close to the roost. Bats at hibernacula from October to April. This species shows high site fidelity if undisturbed. Males are solitary in spring and summer.
Females form maternity colonies.
Hibernates singly or in small clusters, usually several dozen or fewer. Most mating occurs from November-February, but many females are inseminated before hibernation begins. Sperm is stored until ovulation occurs in spring. Gestation lasts 56-100 days, depending on temperature, size of the hibernating cluster, and time in hibernation. Young are weaned in 6 wk and fly in 2.5-3 wk after birth.