Green Corners stands as a quietly thrilling introduction to the rugged trad climbing scene at Boulder’s Main Cliffs. Just shy of 140 feet of vertical challenge unfolds along a steep, gray face that rewards precise footwork and steady nerves. The route begins with a surprising burst of hand crack that demands focused effort without being relentless, before settling into moderate climbing that tests both composure and technique.

Approaching the climb, the northern section of the west face immediately captures attention with its imposing gray rock capped by a vast red overhang. The climb’s sequence starts under this shadow, where a narrow, weathered slot dotted with lichen leads upward to a scrappy tiny pine tree gripping a hold of its own. From this point, the route moves into a tricky section of steep rock that feels less secure than it looks—thin holds with a fine layer of dust reduce confidence, making gear placements sparse and protection harder to trust.

This initial bulging section demands patience and subtle movement rather than brute force. The feeling of hollow-sounding rock enhances the caution needed here, urging climbers to test each hold gently rather than relying on it fully. After pushing past this ‘grungy’ zone, better protection opportunities appear, and the rock gradually firms into cleaner, more reliable features.

The climb’s heart is a right-facing corner leading to a roof in front of an inviting hand crack dyed a distinctive green by mineral stains. Here, the difficulty remains accessible at 5.8, balanced by a few well-positioned footholds that keep the crack’s steepness manageable. Above, a short chimney squeezes upward, but many climbers choose instead to angle right along a thinner crack system, traversing left eventually to reach the anchors.

Protection calls for a standard trad rack, focusing primarily on cams up to #3 Camalot, with doubles useful for securing hand-sized placements. The route’s sporadic opportunities for gear, especially early on, demand thoughtful planning and a steady hand for placements in less-than-perfect rock.

Descending requires caution and preparedness—two 3/8" bolts without chains serve as rappel points, and while the existing slings and rings are aged, they remain functional. A 50m rope is sufficient for the double-rope rappel back to earth.

Green Corners offers a rewarding afternoon climb that’s ideal for climbers looking to carve through a section of Boulder’s Sacred Cliffs with moderate but engaging challenges. The varied climbing keeps you attentive while the enduring landscape offers quiet moments where you can listen to the wind teasing the cracks and the distant calls of birds surveying the valley below.