Drummond's willow occurs from the southern Yukon Territory south through British Columbia to the Sierra Nevada of California and eastward throughout the Rocky Mountains. In British Columbia, it generally occurs 100 miles (160 km) or more inland. In Washington, it is found only east of the Cascade Mountains, and in Oregon, it is found only in the Wallowa and Steens mountains.
Drummond's willow is a deciduous shrub generally between 6.5 and 13 feet (2-4 m) tall, but occasionally up to 20 feet (6 m) tall. Male and female flowers occur on separate plants in erect, nearly sessile catkins. The fruit is a two-valved capsule.
Drummond's willow generally begins flowering in May.