(Because the route goes from the summit of Tijeras Peak to the summit of Pico Asilado, I have attached it to both peak's pages, as the route could be reversed as a means to climb Tijeras Peak as well as a way to climb Pico Asilado.)
Pico Asilado is a dramatic summit just south of the Crestone Peaks, at the edge of Sand Dunes National Park. Any ascent of the peak is a lengthy undertaking with miles of travel from the nearest trailhead. Perhaps this is what makes it so enticing.
Current guide books and other sources describe only two routes on the peak - an ascent of the dramatic North-East Face from Milwaukee Peak's summit, and a long involved affair from the south-west. There is another way.
The following route is not outstanding, and has a stretch on loose and unstable talus (at least the line that I took.) However, it is in a gorgeous setting; parts of which see almost no human visitors. When I made the ascent, there was a magnificent herd of elk, and you get astonishing views of the Crestone Peaks. Furthermore, it allows you to climb both Pico Asilado and Tijeras Peak in a single long day from Lower Sand Creek Lake. With good weather you could even add on the South-West Ridge of Music Mountain on the return...
North side of Tijeras Peak showing the Eastern break in the cliffs.
From Westcliffe, drive about 4.5 miles south along Colorado 69 to Colfax Lane. Take this road five miles to a T intersection where you will go left for a few hundred yards then back right to the south, resuming the general direction you had been travelling on Colfax Lane. There are some signs along the way guiding you towards Music Pass and the Sand Creek Lakes. Do not go west at the T intersection towards South Colony Lake... A parking lot is reached after about five more miles at the lower extent of the trees. It is possible to hike from this point, or continue up the road another several miles to a second lot. In 2009 these last few miles were not bad (I decided as I was walking).
From the upper parking lot, ascend the trail approximately one mile to 11,300 foot Music Pass and its spectacular view of Tijeras Peak. Descend north along the trail into the valley of Sand Creek then ascend the valley for a ways until there is a sign and a trail branching off to the left to Lower Sand Creek Lake. Climb up this trail and its abundance of switchbacks to the shores of the lake. There are some nice camping spots just before the lake on the right.
Tijeras Peak with the Western cliff break.
To climb Tijeras Peak, traverse around the north side of the lake and then up steep forested slopes to the start of the willows. As will be obvious, there is an extensive cliff band wrapping around the entire northern side of the peak at about 12,300 feet in elevation. Luckily, there are a couple weaknesses that can be climbed (after pushing resolutely through the willows). The lower one is a steep left leaning ramp of rock. A couple hundred yards west of this is a less steep but longer ramp that was all snow when I was there in early July of 2009. Once above the cliffs, climb easier grass and talus slopes in a generally south-westerly direction until intersecting with the ridge descending northwest from the summit of Tijeras Peak. Climb this ridge to the summit and the start of the route. Make sure to note the exit point from the cliff band at 12,300 feet, as it is not obvious when looking from above.
Pico Asilado. The route crosses Deadman Creek, climbs up the stepped valley with the classic saddle beyond then turns right towards the summit. Crestone Peak rises beyond and a bit right of the ascent valley.
From the summit of Tijeras Peak, descend the ascent ridge north-west for several hundred yards to the point at which it splits into two (Point 13,290), with one spur heading north to Music Mountain, and the other west. The ridge along the initial descent off of the summit is fairly narrow and requires a bit of care. This is probably a more difficult stretch than anything described below. It is possible to reach the splitting point on the ridge from the northern slopes of Tijeras Peak without actually ascending to it's summit.
Walk along the western ridge until a level section is reached and a snowfield on the slopes below and to the north (at least in early season) is passed. When possible, descend tedious, loose talus to the north-east, arriving eventually at the head of the cirque descending west from the saddle between Tijeras Peak and Music Mountain. Once you are in the floor of this cirque, the going becomes quite pleasant. Descend gradually west to a small grove of trees where this small valley joins the much larger north-south facing valley of Deadman Creek at approximately 11,700 feet.
The route descends from Tijeras Peak, right past the snowpatch, then back left to the head of the cirque. From here it continues past the patch of trees to the photo location.
Cross this larger valley, and continue west into the valley originating at the pass between Pico Asilado and Pk. 13,020. This valley has several fairly level stretches, separated by short but steep steps. This is a beautiful area, and one with no trail access from below or any of the ridges above. When you have climbed the last of the steep steps, turn north and ascend up largely stable tundra and rocks before reaching the head of the cirque, and the 12,660 foot pass. Aim for a point where the ridge above becomes a steep rocky scramble. When you reach the ridge, you will join with the southern/western route described both on SummitPost, and in the Garratt and Martin book. The rocky ridge is supposedly an exposed scramble, but an easier alternative is to climb a shallow depression just to it's right. There is some loose rock along this stretch. Cross over a south-east ridge to Pico Asilado and continue either directly up the summit ridge, or on slopes just to its south. The summit is dramatic and obvious. From here you get a fantastic view of the Crestone Peaks, as well as a nice glimpse down the North-East Face of Pico Asilado.
The route climbs up vegetated slopes towards the snow patch, continuing to the right of this in the direction of the summit.
Descend and return back the way you came, descending down the northern slopes of Tijeras Peak once the ridge connecting it with Music Mountain has been crossed at 13,000 feet or so.
This route could be used as a descent route for parties who made an ascent of the North-East Face, and in this way an ascent of Milwaukee Peak, Pico Asilado, and Tijeras Peak could be made in a single day. One word of caution, though - the breaks in the cliff on Tijeras Peak are difficult to see from above and might be hard to find by parties who had not ascended them. The eastern break is marked by a couple cairns on a slight prominence at the very edge of the cliff. Once at the northernmost cairn, descend on the left (western) side of this small prominence. It looks improbable from above, but after about thirty feet climb up and west over a fin of rock into the steep descent gully. There was a fixed rope here in the summer of 2009.
For added fun, it is not that far out of the way to continue down the south-west ridge of Pico Asilado, across the 12,660 foot saddle and up a short but steep climb to the summit of Peak 13,020.
For even more fun, the beautiful south-west ridge of Music Mountain could be climbed on the return trip from the clump of trees mentioned at the junction of valleys. I'd intended this but opted against it when bad weather moved in... Be aware that the East Ridge of Music Mountain is very steep and exposed, but this would make for a very nice finish to the day.
This would be an extremely long day from the trailhead, so camping gear will be needed for most people to camp near the shores of Lower Sand Creek Lake. Once on the climb, standard hiking gear is recommended. Both breaks in the cliff of Tijeras Peak are north facing, so bringing an ice axe and crampons would be a good idea.
View of Tijeras Peak from the summit of Pico Asilado.
The Garratt and Martin book, Colorado's High Thirteeners, gives a nice description of the other routes on Pico Asilado as well as the climb noted above for Tijeras Peak.