The approach can be long (17 miles) with a 2WD or relatively short (4 miles) with a 4WD. The recommended trailhead is the South Colony outside of Westcliffe, CO. This is the same approach as for Crestone Needle, Kit Carson, and Humboldt peaks.
From the 4WD parking area at about 11,100 feet follow the forest service road (gated) southwest to the Lower South Colony lake. There is lots of camping at both Lower and Upper South Colony Lakes as well as higher up on the Bear's Playground at just over 13,000 feet.
From Lower South Colony Lake hike northwest to Upper South Colony Lake. From here you can often see the switch-backing trail that leads to the ridge connecting Humboldt on the right and Crestone Peak around the corner to the left. During early spring there are excellent snow gullies leading up to the same ridge which avoid the scree and switch-backing of the main trail. Follow the ridge to the left/west until you reach a broad area around 13,000 feet known as the Bear's Playground. From here you get great views of Kit Carson and Crestone Needle's classic Ellingwood Arete.
From the Bear's Playground the climbing and route finding begin.
Follow the ridge west towards Crestone Peak and then traverse right at around 13,500 to reach the Northwest Couloir which is in the center of the peaks Northwest Face. Several false couloirs must be passed before reaching the proper one. You must enter the couloir at the highest accessible point to avoid the very steep and dangerous cliffs at the bottom of the couloir.
Now that you are in the Couloir you must ascend Snow and ice between 30-40 degrees, depending on conditions, for about 800 feet to the saddle between the two summits of Crestone Peak. Ropes are not required, but an ice axe is a must as a sliding fall here could mean falling over the cliffs at the base of the couloir.
From the saddle scramble west/right for about 250 vertical feet on class 3 rock to the true summit.
Descend the climbing route or continue down the South Face for a longer but more interesting return to South Colony Lakes.
When descending the Northwest Couloir, take care to not glissade or have an uncontrolled slide until saftely out of the couloir. Also make sure to exit the couloir at the point of entry and not below to avoid the steep cliffs below.
attm adds the following:
There is a fork in the couloir that can be confusing. They look very similar in difficulty but only the left fork is the correct route. The right fork will get steeper and steeper and dead end. I found out this the hard way. Be sure and take the left hand fork!
Ice axe and possibly crampons. A helmet is highly recommended as rocks and ice can fall from climbers above.
This route is best done when the couloir has stable snow. Without snow the route would be a dangerously loose shooting gallery.
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