The northern hoary bat is a presence in Colorado. Open occurrence databases hold just 167 records for it, of which 27 are iNaturalist observations, a thin tally that reflects both the difficulty of documenting a fast, high-flying bat and the genuine scarcity of a solitary migrant.
A tree bat, not a cave bat
The hoary bat roosts alone in the foliage of trees rather than in caves or crowded colonies, wrapped in the frosted fur that gives it its name. Colorado records scatter from the Pikes Peak foothills near Colorado Springs to the wooded river corridors of the west, wherever there are trees to hang in and open air to hunt moths above. Park and Montezuma counties hold the most.
Here for the warm season only
The seasonal signal is stark: near-total absence through winter, then a sharp concentration in midsummer and the late-summer weeks. This is not hibernation but migration. Hoary bats are long-distance travelers that spend the cold months far to the south and pass through or breed in Colorado only while the nights are warm and insects fly. That is why NatureServe gives it a breeding-season rank, S3B, and treats it as vulnerable, a status weighed down partly by the toll wind turbines take on migrating tree bats.
Status in Colorado
Native, migratory, and ranked vulnerable in its breeding season. It is one of the widest-ranging bats in the Americas, yet nearly every Colorado record is a single animal caught on the wing or found tucked into leaves at roost.
Full species profile
