Hoary bats are among the largest bats in Oregon, with frosted, silver-tipped fur that gives them their name, and they roost alone in tree foliage rather than in caves or buildings, which keeps them well hidden through the day. Records near the Willamette Valley’s wildlife refuges and oak woodlands trace this species’ preference for tree cover over open desert or rock terrain.
Records run thin from April through November with no single dominant month, spread evenly enough that little seasonal pattern can be drawn from just 18 sightings. NatureServe ranks the species S3, vulnerable, in Oregon, and it’s known to be a long-distance migrant, which may explain why it turns up unpredictably rather than in one clear window.
Full species profile
