— — the rock the road bends around.
“Picketpost stands alone above the Boyce Thompson Arboretum, a 4,375-foot block of dark volcanic rock that catches the eye on the drive east from Phoenix toward Globe. The Arizona Trail crosses its north flank on Passage 18. A small metal ammunition box on the summit holds the climbing register, with entries running back to the 1960s.
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Picketpost Mountain rises to 4,375 feet just south of US-60 near the old copper town of Superior, Arizona, about an hour east of downtown Phoenix. The mountain is dacite and andesite from the mid-Tertiary volcanic field of central Arizona. Boyce Thompson Arboretum, the state's oldest and largest botanical garden, sits at its base on the Queen Creek floor. The peak forms a recognised waymark on Passage 18 of the Arizona National Scenic Trail, which crosses from the Gila River basin up toward the Superstition Wilderness.
The summit cap is dacite, a fine-grained volcanic rock laid down roughly 20 million years ago during the regional eruption sequence that built the Superstition and Pinal volcanic fields. The dark cliffs read black-brown at noon and copper at sunset. A small metal ammunition box on the summit holds the climbing register, with entries running back to the 1960s; the volunteer who maintains the box swaps a new book in roughly every five years. The peak's name comes from a 19th-century military picket post stationed nearby.
The Picketpost trailhead sits south of US-60 near milepost 221, with a small lot maintained by Tonto National Forest. The summit route climbs about 2,000 feet over roughly two miles, with no marked trail past the saddle and exposed Class 3 scrambling on the upper block; cairns and a topo map are essential. The arboretum at the base is open year-round with about 3,900 plant species from the world's deserts and is a quieter alternative for anyone not climbing. October through April is the comfortable window.