South Mountain is the United States largest municipal park. It is full of monzonite boulders that are mostly unclimable, however there are few good quality problems for those that are willing to hike and look hard. The boulders are mostly low balls but some are tall and proud. There is also some potential for harder and higher problems for the next generation.
There are multiple access points to the park, but for the largest concentration in boulders head to the east entrance off of Guadalupe Rd. From the entrance take the national trail to the small wash that cuts right off the main trail. Walk 1/2 mile to the entrance boulders. From here there are many boulders scattered throughout the wash going west.
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