Scottsdale hike: Tom's Thumb Trail - Thoms thumb
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McDowell Sonoran Preserve. Tom's Thumb Trail is a 4 mile heavily trafficked out and back trail located near Scottsdale, Arizona that features beautiful wild flowers and is rated as difficult. Tom's Thumb Trail is a short switchback trail from Tom's Thumb trailhead up to Tom's Thumb. A stiff climb on desert singletrack leading to fantastic views of Tom's Thumb and the surrounding area. Near Rio Verde, Arizona.