What is the tallest peak in Arizona? The tallest peak in the state of Arizona is called Humphrey's Peak. Humphrey's Peak was named for a Union general in the Civil War, although some early maps refer to it as San Francisco Peak, since the range that contains it is known as the San Francisco Peaks.

So, we know that Humphrey's Peak is the answer to the question of what the tallest peak in Arizona is... but how tall is it?
Located within a range of ancient volcanic peaks, Humphrey's Peak is a popular destination for hikers and climbers, and can be accessed by the popular Humphrey's Trail. The trail measures 4.8 miles in length and begins at the Arizona Snowbowl ski resort and travels all the way to the mountain summit.
Many hiking enthusiasts refer to Humphrey's Peak as “the best hike in Arizona.” The trail begins in meadow-like territory and very quickly increases in elevation. Climbers should be aware of inclement weather, since things can change very quickly in this area, and should also plan for the cold ahead – near the tree line, Humphrey's Trail traverses what is known as the only tundra terrain in Arizona.
Once reaching the summit, things become quite a bit rockier, and the hike goes through alpine forests before eventually clearing to reveal panoramic views. The Grand Canyon can be seen in the distance, provided the weather is clear, when you reach a high enough point on the trail.