The Pima Canyon Trail in the Santa Catalina Mountains goes from hot, open desert to a shady riparian area and up into cool reaches of Mt. Kimball. Hikers can make it as hard as they want, with an elevation gain of more than 4,000 feet in six hours. But the trip into the shade of cottonwood trees in manageable for hikers in good shape. Trailhead is at the end of Magee Road east of Oracle Road.

The trail was not without controversy. Access was an issue in the 1980s and 1990s, when hiking advocates and the Pima County Board of Supervisors negotiated with the developers of Pima Canyon Estates for access to the popular trail. Several luxury homes burned to the ground in Pima Canyon Estates in 2001. Investigators labeled it arson. Some people labeled it eco-terrorism.

The trailhead is named for Pima County Supervisor Iris O. Dewhirst, who worked to preserve public access to Pima Canyon.