Lifecycle of the Saguaro Education Hike at Granite Mountain Trailhead Native only to the Sonoran Desert, these giant cacti are a sight to see! Join PastFinders Don Brockway and Chris Crum to follow the growth of a Saguaro from seed to skeleton and view multi-armed, old Saguaros. This Moderate hike covers 4 miles in about 3 hours over some rolling hills.  Bathrooms available at the trailhead. Bring water and snacks for the trail.  No dogs please. Arrive 15 minutes before start of hike.