ah yes the San Juan Mountains of Colorado. Twilight peak is in the West Needle Mountains, a sub-range of the San Juans. The standard approach is via a trail from Molas Pass to the north. The trail leads to Crater Lake from where the summit is accessible.
Adjacent to Twilight Peak are North Twilight Peak (13,075 feet) and South Twilight Peak (12,932 feet).
you will definitely have fun.
Driving north from Durango towards Purgatory Ski Area, your view is dominated by the West Needle Mountains. This small range within the San Juans is made up of only five peaks: Twilight Peak, North Twilight Peak, South Twilight Peak, West Needle Mountain and Snowdon Peak. These low 13er's (highest peak is Twilight @ 13,158 feet) are seldom climbed despite their attractive appearance. Perhaps due the numerous higher peaks in the area or lack of an established climbers route. Don't overlook the West Needles, what they lack in elevation, they make up for in character
There are two ways to approach Twilight Peak, only one could I recommend to anyone I liked. I will describe this approach first.
1.) This approach starts at Andrews Lake. Located a few miles south of Molas Pass or about 12 miles south of Silverton, Colorado. From Andrews Lake, follow the very nice trail south for about 5 miles to Crater Lake. This is the start of the climb. Crater Lake has some nice places to camp, if you want to turn the trip into a backpack.
2.) This more strenuous approach starts at the Old Lime Creek Rd Campground. A few miles north of Purgatory Ski Area there is a sharp right turn, just after this turn is a sign for Old Lime Creek Road. Take this right turn and follow the bumpy dirt road a few miles down to a campground right on Lime Creek. This is the start of the second approach. From this camp there is no trail and the route ascends over 5,000 vertical feet in only a couple of miles.