September 4-5, 2020 It’s the tallest mountain in Arizona. And it’s volcanic (No, not active!). Well, every mountain around Flagstaff is volcanic in origin. In fact, I think Flagstaff is home to all five different types of volcanoes. The area is peppered with hundreds of cinder cones, but Humphreys Peak dominates the horizon in an otherwise flat expanse across the Colorado Plateau. At 12,637 feet with a prominence of 6,039 feet, the peak is an impressive site, so it’s no wonder it’s a popular destination for peak baggers and day hikers, as well as sacred to several native tribes.