Bear Gulch Cave Trail

Overview

This is Pinnacles’ crowd-pleaser: a short, cave-forward hike to a tranquil reservoir framed by volcanic cliffs. Expect about 2.0 miles round trip and a bit over 300 feet of gain if you go to Bear Gulch Reservoir and back, or make it a classic loop (Moses Spring up, Rim Trail down) for roughly 2.2 miles and ~500 feet of gain. Difficulty is easy to moderate on paper, but the cave’s tight squeezes, stairs, and darkness make it feel a notch spicier.

Route

From the east side of the park, start at Bear Gulch Day Use or Moses Spring parking. Walk roughly 0.1 mile on High Peaks Trail, then turn onto Moses Spring Trail. You’ll reach the Lower Bear Gulch Cave entrance about 0.5 miles in. Inside: pitch-black passages, stone stairways, metal handrails, and occasional stream crossings. Emerge at the CCC-built Bear Gulch Reservoir (the dam dates to 1935). Return the way you came, or complete the loop via the Rim Trail for different views. A shorter, cave-focused out-and-back of about 1.3 miles is possible if you turn around sooner.

What You’ll See

This is a talus cave—think a narrow canyon roofed by huge toppled boulders—so the geology feels wild and sculptural. After winter and spring storms, water audibly courses through the cave, with slick rock and sometimes ankle-deep puddles. The reservoir area is serene and photogenic and also important habitat for the threatened California red‑legged frog. Look and listen for bats (including Townsend’s big‑eared bats) using the cave system.

Best Times to Hike

Spring and fall are prime: cooler temps, dramatic cave waterfalls after storms, and softer light at the reservoir for photos. Summer can be blazing on exposed approaches, and the cave system typically closes in summer (often starting in late May) for a bat maternity colony. The lower cave is open more of the year, while the upper cave opens only briefly—always verify current cave status before you go.

Gear and Safety

Bring a real headlamp or flashlight (a backup too); phone lights aren’t enough for the darkest sections. Wear grippy, closed‑toe footwear—rocks and stairs can be wet and slick. Expect narrow spots where you’ll duck, squeeze, or briefly scramble; those with claustrophobia may find this challenging. It’s cooler and damp inside, so pack a layer. Outside the cave, watch for poison oak, stinging nettle, and rattlesnakes.

Parking and Logistics

Park at Bear Gulch Day Use or the small Moses Spring lot (very limited; expect to walk from farther down on busy days). Arrive early on weekends and holidays; the east entrance fills quickly. No pets on this trail, and it isn’t stroller or wheelchair friendly due to stairs and tight spaces. Plan 1–2 hours depending on cave conditions, crowds, and photo stops.

Alternatives

If the caves are closed, you can still reach the reservoir via Moses Spring Trail without entering the cave. Looking for a similar vibe from the west side? Consider Balconies Cave when open.