Boyce Thompson Arboretum
Located east of Phoenix off highway 60, Boyce Thompson Arboretum is known for their Fall Foliage Finale on Thanksgiving weekend. Aspen and maple leaves have fallen in the San Francisco peaks and Catalinas by mid-November, but the true grand finale of autumn foliage in Arizona is at the Arboretum in November, with peak color typically during Thanksgiving weekend. More on the Boyce Thompson Arboretum's Fall Foliage.
Sedona's Oak Creek Canyon
You'll find fall foliage in Oak Creek Canyon any time between October and December. You'll need to check with the Visitor's Center. One of the best places to see the fall foliage is the West Fork Trail but you'll enjoy fall foliage at the right time throughout Sedona.
The Flagstaff and surrounding areas offer a variety of fall colors from late September to early October. Expect to see an abundance of red, orange and yellow leaves. There are Aspen groves and deep canyons. Here is a great site describing where to find the fall color in Flagstaff.
Coconino National Forest
You may see Fall color in Coconino National Forest as early as mid-September. Kaibab National Forest
There are a number of scenic drives on the Kaibab National Forest that provide great opportunities for viewing fall colors. Watch carefully as you drive along forest roads; you may catch a glimpse of a Kaibab squirrel amongst the golden aspen, or a flock of wild turkey along a meadow’s edge.