Curbie stands as the leftmost challenge on Upper Tier’s rugged face at Frustration Creek, inviting climbers with a straightforward yet engaging ascent. From the worn log bench that marks the route’s start, you ascend three bolts following clean face holds, the rock’s subtle texture guiding your rhythm. As you progress, the climb eases into low-angle terrain where the route veers right, steering clear of a tougher alternate to the left that tests finger strength and foot precision.

A compact roof comes into view, asking for a brief surge of power before the path splits again. The preferred finish swings left into a dihedral, offering a satisfying mix of balance and technique on solid holds, while the alternative right exit is softer, less committing but still enjoyable. The final moves take you across a mellow slab that leads smoothly to the anchors.

Though the pitch measures only about 100 feet, it demands attention to footwork and roll with an efficient climbing style. The nine well-spaced bolts and reliable sport anchor provide confidence to push upward but expect to engage your core and adapt to the changing angles. After topping out, you can lower straightforwardly or extend the adventure by moving up and left toward the nearby Sidewalk ledge, which opens possibilities for linking climbs or easing into a rest.

Situated within the San Bernardino Mountains just off Highway 38, this climb offers more than just vertical movement—there’s a tactile feel of the granite beneath your hands and a cool breeze that cuts through the sparse forest around the crag. On a clear day, the sky stretches wide, and the quiet hum of the forest frames your ascent.

This route suits climbers looking for a solid warm-up or a tactical outing when time is limited. Its moderate rating makes it accessible, yet the variations on route-finding and the roof section keep it engaging. Planning ahead for the southwest-facing wall means morning climbs bring pleasant shade, while afternoons can warm up under the sun. Bringing sturdy shoes with reliable edging capability and enough quickdraws to clip the nine bolts will keep your ascent smooth.

The approach follows a gravelly track descending from Highway 38, a short 10–15 minute hike to the base. Keep your attention on the clear signage and minor treks through scrubby brush. Hydration is key, especially in warmer months when the San Bernardino sun is sharp. Secure your gear carefully since the cliff’s edge offers little room for error on the ledge. Once finished, retracing your steps or wandering to adjacent routes is uncomplicated, making Curbie a practical yet refreshing outing for sport climbers exploring Upper Tier’s quieter corners.