Chock Stone presents a compact but engaging trad climb tucked into the rugged confines of Castle Rock Proper, part of California’s iconic San Francisco Bay Area climbing scene. Positioned just left of the moderate 5.5 summit route and flanked by a massive cave to the right, this 45-foot climb offers a unique opportunity to test your technique and stamina without demanding a full-day commitment. The route features a pronounced dihedral—a natural, inward-angled crack system only about 30 feet high—allowing climbers to rely heavily on stemming, a move where opposing pressure is applied using hands and feet on both sides of the corner. This makes Chock Stone a practical choice when the arms are already feeling the fatigue from longer or more strenuous climbs nearby.

Starting with relatively straightforward moves, the climb flows until you reach a distinctive 5.8 bulge or roof that marks the crux. This section requires a blend of power and technique, as you navigate an overhanging feature that demands careful foot placements and confident hand jams to inch past the challenge. Once over the crux, the climbing eases considerably, providing a satisfying payoff that rewards the effort with easier scrambling to the top anchor.

Protection on Chock Stone is straightforward but calls for traditional gear savvy. There’s no bolted anchor at the problem itself, but climbers can top-rope by ascending the nearby summit route and using a natural rock hole, combined with a solid single bolt, to fashion a reliable equalized anchor system. This method ensures safety without compromising the climb’s natural character. Although the route is brief, its position within Castle Rock gives climbers access to stunning views and the chance to immerse themselves in the area’s rugged sandstone walls and forested surroundings.

This climb is an excellent option for those looking to sharpen their trad skills in a low-commitment package or to stretch out parts of their body when other climbs have taken their toll. The rock’s texture offers dependable friction, and the dihedral's shape feels almost inviting as it offers rests along the way. Remember to wear sturdy shoes with good edging ability and bring a set of traditional cams and nuts that fit smaller cracks, as the placements here require precision and attention.

Castle Rock itself is well-loved for its varied terrain, ranging from easy scrambles to steeper trad lines. Its proximity to San Francisco Bay means climbers benefit from mild weather year-round, though mornings and late afternoon often bring the best light and cooler air. The approach to Chock Stone involves a short hike on well-maintained trails through shaded groves of oaks and firs, setting the scene with the quiet sounds of wind through branches and distant bird calls.

For those planning their day, bringing at least two liters of water is advisable, and starting early can help you avoid warmer midday temperatures. A lightweight helmet is recommended to protect against occasional rockfall, especially near the summit area. Though the climb feels accessible, respect for Castle Rock’s natural environment and cautious route-finding will ensure a rewarding experience every time.