Tom's Thumb, North Side is located in Scottsdale, Arizona. Best cross streets to use are Dynamite and 128th St. Tom's Thumb is the prominent granite bump in the McDowell Mountain preserve. Easily visible from the Scottsdale area, Tom's Thumb Trail from the north side provides some great views of Phoenix as well as looking out toward Four Peaks and Weavers Needle. The trail is very well manicured, and will be nice hiking except for some steep elevation gains. Following the Tom's Thumb Trail you pass many other trails that go off to climbing areas that I saw several people using so consider those as well if you like to climb. You can also climb Tom's Thumb itself when you get to the top. My trail brought me around in a big loop but having done it I would recommend you do an up-and-back as my return trail was NOT maintained and even steeper and full of loose rock.