Hike Moses Spring Trail to Rim Trail Loop

Starting near the Bear Gulch Nature Center, this loop wastes no time getting interesting. Within minutes you're threading through narrow rock corridors and scrambling over boulders left behind by an ancient volcano — Pinnacles is built from the eroded remains of a volcanic field that split apart along the San Andreas Fault. The route climbs through Bear Gulch's talus caves, where massive rocks have tumbled together to form dark, cathedral-like passages (bring a headlamp, seriously). You'll pop out at the Bear Gulch Reservoir, a surprisingly peaceful rock-ringed pool tucked into the canyon. From there, the Rim Trail earns its name with exposed ridge walking and sweeping views across the spire-studded landscape. The descent loops you back through oak woodland and more volcanic formations. This one is perfect for hikers who want variety — caves, water, views, and geology packed into a quick loop.