Big brown bat records in Idaho cluster around the Sawtooth National Recreation Area, the Frank Church-River of No Return Wilderness, and Boise National Forest, rugged mountain country where this bat roosts in rock crevices and old buildings alongside natural cavities.
Reports peak in July and August, when maternity colonies are most active and young bats begin flying, though with only 36 total records the state’s overlay flags timing as not well documented overall. NatureServe ranks the species S3, Vulnerable, in Idaho, a more cautious grade than this widespread species often carries elsewhere.
Full species profile
