All Locations > California > San Francisco B… > S Bay Area > Castle Rock & S… > Castle & Sanbo… > Biddles

Triple X Boulder Climbing

Climbing Area Map

Routes in Triple X Boulder

L › R R › L A › Z

Ooo V2 5+

Order Wrong? Sort Routes

Explore this area in 3D

Use onX Backcountry to explore the terrain in 3D, view recent satellite imagery, and more. Now available in onX Backcountry Mobile apps! For more information see this post.

Elevation:	2,824 ft	861 m
GPS:	37.22547, -122.07586 Google Map · Climbing Area Map
Page Views:	12 total · 12/month
Shared By:	Joe Forrester on May 26, 2026
Admins:	Aron Quiter, Mike Morley, Adam Stackhouse, Salamanizer Ski, Justin Johnsen, Vicki Schwantes Page Updates (admin only)

See Weather Forecast

Access Issue: RAIN, WET ROCK CLOSURES; The sandstone around Castle Rock is fragile and is very easily damaged when it is wet. Details

WET ROCK: Holds rip off and climbs have been and will continue to be permanently damaged (like Donkey Dong and countless others) due to climbers not respecting this phenomenon. After a heavy storm the rock will remain wet, sometimes for several days. PLEASE DO NOT CLIMB AT CASTLE ROCK during or after rain.

Access Issue: Trails are closed from sunset to 6:00 am. Details

Trails close at sunset. Give yourself enough time to be back at your vehicle (or campsite if you're staying at one) before dark, or the rangers will fine you.

Always visit the Castle Rock State Park website parks.ca.gov/?page_id=538 for fairly current official information.

Description

A fun boulder a little bit down the trail from the Biddles. Has a couple of fun lines V5 and under. A bit of a slopy landing, but worth checking out if you are in the area.

Getting There

From the fork in the Sanborn trail, hike right about 250 yards. There is a sign saying "Bike Route", take this trail. Hike until you see a large dead upright tree on your left. Picture below. The go down the hill, angling to skiers right until you see the boulder. It is about 75ft from the trail.