Trip report
Oct 12, 2021 — Keystone Peak is the high point of the Sierrita Mountain range in Arizona. The peak is most easily accessed via a service road that leads the whole way to the summit. The mountain really not close to pretty much anything, but despite how far it looks on a map from civilization, there's a small town nearby. Reaching the trailhead is easy, and I parked at some water tanks next to the gated road. It doesn't seem to be an issue to do so. I hiked past the locked gate and followed the road as it slowly ascended toward Keystone Peak.
The road curved in and out of major gullies until the final steep approach to the summit, where there were nice views toward the more distant and impressive mountains of the area. On the way back I took a quick detour along a lesser-used dirt road up to Keystone Peak North, and then followed an overgrown dirt road back down to the main road. I headed back the same way. Nice views and good exercise, but not exactly a destination peak.