The main problem with Twilight Peak comes, according to some sources, along the north ridge and near the summit. Studying the peak from North Twilight you can see another “notch” problem but can not really tell what will be the best way to negotiate it. So descend about 300 feet down to the connecting saddle, passing a large cairn made of white quartz, and begin the ascent up Twilight's north ridge, for a brief while on tundra and small scree. Hike up the easy lower ridge section and progress to within 100 or 150 feet of the prominent notch. Watch carefully for a faint path leading off the ridge and contouring to the right, off the main ridge (about where the tundra plays out). Follow the path (or make your own contour path) over to an outcrop overlooking the deep gash that comes down from the notch above. The path descends about 75 feet into the gash. The descent is a little dicey. Once in the steep and narrow couloir, there is really only one immediate exit possibility. A very steep and narrow, secondary couloir heads toward the summit, climbing out of the main couloir. Going up it involves some 3rd class climbing on mostly solid rock with some small tundra benches interspersed. (See photo gallery) It was a little exposed, but we never felt too uncomfortable so we scrambled on up at least 150 vertical feet. Near the top, we chose a right fork in the couloir and this brought us out on a much easier slope for a stroll to the summit. The left fork probably goes just as easily. All in all, this was easier than we expected. It took us 45 minutes from the North summit.
Once you're done with the mesmerizing view of the Needle Mountains to the west and a rest break, it's time to head back. From here, you could retrace your route back toward North Twilight, down its east ridge and back to Crater Lake. But we decided to press on to the southeast, descending Twilight Peak and heading toward South Twilight, which is unranked. The traverse is easy and takes only about 10 minutes. There is about a 260 foot gain to the summit where you can spend some additional time studying how to ascend West Needle, either this day or the next. If not going on to West Needle Mtn. at this time, then much of the return route we describe here will become your approach to West Needle the next day.
So head south off South Twilight toward a saddle. The descent is quite steep. We stayed on slopes or a moderate gully just south of the main ridge. It was high class 2 work, with even very brief class 3 at times, but kind of entertaining in some places. Once at the saddle and looking back up, it appears rather difficult. The saddle is marked by a standout gendarme. From the saddle, descend north, at first down a steep, grassy slope that eventually gives way to more rocky terrain. We did all we could to avoid the rock fields and utilized all the tundra we could find, but at times had to resort to some rock hopping. Descend to below 11,800 ft. and then follow a bench area over past the small, unnamed lake and northeastward for a short distance. Work your way down a steep gully that deposits you on the west side of the flowing stream (but still above it) that drains the small lake, but the stream does not show on the map. Watch carefully from above to spot a faint trail that leads across the slope below the east ridge of North Twilight. Do not decide to keep elevation and contour northeast and upward toward the saddle southeast of Crater Lake. This will be a time-wasting mistake, turning into an interminably long and rugged traverse across loose rock slopes.
If you find the trail we mention here, follow it NE as it contours across the open slope toward Watertank Canyon. Much of this game path crosses through tall grass. As you approach the canyon and some trees, begin heading up the slope and into the open trees, staying on the SW side of Watertank Canyon. When the canyon is in view, you'll see a place where it dramatically steepens as it heads down to the Animas. You want to get above that drop. Once you do, stroll NNW through the remaining trees and then lower willows to the small pond at the crest of the canyon where Crater Lake comes back into view. There is a fairly easy trail to follow in this section. Chart your preferred route back to your campsite, but keep in mind that there are cliffs above the south end of the lake that force you up and then back down, if trying to go that way for the western shore.
Links to other information, routes & trip reports for this peak that may be helpful.