Washington’s canyon bat records come from the dry half of the state: Whitman County in the Palouse leads, with Walla Walla, Klickitat, and the Columbia Basin counties behind. That’s shrub-steppe and basalt country, coulees and rimrock cut by the Columbia and Snake rivers, and it’s the northern rim of this desert bat’s range.
The month pattern is unusual. Most bat records in Washington pile up in midsummer, but canyon bat reports here lean into fall, with October holding the largest share. Late-season swarming and movement toward winter roosts put bats on the wing when surveyors can catch them. This species also flies early in the evening, which makes it easier to net and detect than most.
One caveat hangs over the whole file: the newest record is from 2014. For a bat ranked vulnerable in Washington, a decade of silence means either the surveys stopped, the bats did, or both. Hanford Reach and the Columbia Basin’s coulee country remain the obvious ground to check. A species this tied to rock and warmth doesn’t vanish quietly; it just stops being looked for, and those aren’t the same thing.
Full species profile
