Mt. Blue Sky, known until recently as Mount Evans, stands as one of Colorado’s most formidable high-altitude bouldering destinations. This alpine landscape, set above 10,000 feet, presents a unique blend of world-class granite problems and rugged wilderness that commands respect and preparation from every climber who ventures out here. The sprawling slopes of this accessible 14,000-foot peak are scattered with large, high-quality granite blocks that invite both aspiring boulderers and seasoned climbers to test their limits amid a wild, ever-changing environment.

Climbing here is an experience shaped as much by the setting as by the rock itself. The granite is exceptionally featured with a coarse texture — offering solid, often incut holds, and idiosyncratic knobs reminiscent of California’s famed Tuolumne Meadows. However, this is not an easy walk in the park. The approach to even the most frequented boulders demands grit. It’s a grueling haul that has left more than one visitor vowing never to return, especially to reach the most prized problems scattered across the slopes. For those targeting further-flung areas, the trek becomes even more punitive, turning a daytrip into a full-on alpine adventure.

The climbing season here is painfully short, hemmed in by unpredictable weather. Summer days can begin with crystal-clear skies and end suddenly under looming storms, high winds, or unexpected snow. The intense sun and thin mountain air accelerate dehydration and exhaustion — doubling down on the need for careful hydration and pacing. From a safety standpoint, injuries or emergencies require cautious planning since rescue is complicated by the terrain’s remoteness. Mosquitoes also emerge as an enduring nuisance in the lower glacial valleys near the climbing zones.

Most bouldering occurs along the northeast-facing Chicago Lakes Basin, a stunning glacial valley that houses the most accessible blocs arranged into Areas A, B, C, and D. These areas contain standout problems like Timeline, Gorillas in the Mist, All Dogs Go to Evans, and Dali — strong testpieces that beckon climbers looking for classic challenges. South of the main highway, Lincoln Lake offers additional excellent problems that reward the effort of reaching this quieter zone.

Access to Mt. Blue Sky requires navigating specific logistics: drive about 30 miles west from Denver, through Idaho Springs, then follow CO 103 up to the mountain. For most popular zones (Areas A & C), the Echo Lake Picnic Area car park is the starting point, located near mile marker 13 on the road. Area D requires a pass on the toll road to Summit Lake. It’s important to note that as of 2025, the summit road is closed for vehicle traffic, making all climbs accessible only by hiking, so plan accordingly for longer, more demanding approaches.

Climbers must be mindful they are within the Mt. Blue Sky Wilderness Area managed by the US Forest Service. Respecting Leave No Trace principles is vital: vegetation here recovers slowly from damage, crash pads must be used carefully, and excessive chalk use visible from trails is discouraged. Noise and dog behavior should be regulated to maintain harmony with the many non-climbing visitors enjoying this protected land. The rules are strict about pad stashing, which is prohibited, adding to the challenge of minimizing gear haul on the approach.

The classic problems here span a notable range of boulder grades, attracting climbers seeking both fun and project-level challenges. From approachable V1s like Timeline and The Ladder, to harder climbs like Dark Crystal (V3), the imposing The Brown Seam (V4), and the intense Tiger-eater problems like Tomahawk (V10) and Tattooed Teardrops (V11). The well-regarded climbs here all share stellar granite quality and unique alpine atmosphere that elevate them beyond mere checklists.

Weather and altitude dictate best climbing windows: summer months are prime but require early starts to beat afternoon storms. The northeast-facing aspects of the Chicago Lakes areas mean mornings deliver direct sun and warmth, while afternoons bring cool shade and shelter from intense solar rays. Evening storms roll in quickly with little warning, making timing and weather awareness essential.

The descent from climbs is mostly via hiking trails that connect back to parking areas. Due to the rugged terrain and high altitude, climbers must take care with their footing and pace. There is no rappel needed, but route-finding can be tricky after dark or bad weather.

Mt. Blue Sky’s combination of demanding altitude, exceptional granite, and wilderness setting makes it an unforgettable destination for climbers who seek more than just a bouldering session — it’s an alpine adventure that pushes both body and mind. Proper preparation, respect for the environment, and a readiness for rapid weather changes are prerequisites to experiencing what this revered Colorado bouldering zone has to offer.