Two subspecies present in British Columbia:
1) Aegolius acadicus.acadicus
"Breeds from southern Alaska to central Saskatchewan and northern New Brunswick, south to southern California, southern Arizona, southern Mexico, western Texas, Missouri, southern Michigan, Maryland; also in Great Smoky Mountains. Winters generally throughout breeding range (some southward withdrawal), irregularly or casually south to southern U.S" (BCCDC 2012).
2) Aegolius acadicus.brooksi
This subspecies is endemic to the Queen Charlotte Islands (BCCDC 2012)