This trail up the Guller Creek drainage is the standard route to Janet's Cabin. Begin at the Union Creek Trailhead at Copper Mountain ski area. From Union Creek you have two choices.
Option one, ride the lifts
The popular option is to ride K and L lifts to the top of "West Tenmile" ski trail. You can get a one-ride lift ticket by presenting your 10th Mountain confirmation letter at the ticket window at Union Creek. Ski about 1/4 mile down the extreme W (left) side of the West Tenmile ski trail to a backcountry gate in the ski reasort boundary (10,640 feet, an altimeter eliminates guesswork here). A blue diamond marked trail heads from the gate W through the forest.
Option two, hike
Ski .6 miles up the extreme west (looker's right) side of "Roundabout" ski run to the base of L lift. Continue up the extreme west (looker's right) side of "West Tenmile" ski run .6 miles to where a backcountry gate marks the ski trail leaving the ski area boundary at elevation (10,640 feet, an altimeter eliminates guesswork here). A blue diamond marked trail heads from the gate W through the forest.
In either case, after you leave the ski area follow an obvious trail-cut (take your skins off) as it traverses then drops W into the Guller Creek drainage to cross Jacque Creek and Guller Creek in an open area at 10,460 feet. From the crossing, the trail stays on the N side of the creek for 2 miles to about 11,120 feet. Here the valley widens and becomes very low angled. Switch to the S side of the creek here, and continue up the drainage another mile to where the valley steepens and narrows. Put your skins on here.