St. Charles Peak can be climbed from three different starting points. Two are easily accessible from Lake Isabel, the other comes from Greenhorn Mountain Road.
Greenhorn Mountain Road
The shortest and easiest access to St. Charles Peak is from Greenhorn Mountain Road 369. Follow this road for about 2.1 miles, at this point an old logging road takes off from Road 369 and peters out after about a mile. Most vehicles will want to park at the junction. It is a little over two miles to the summit. The peak is barely above tree line, dome shaped, with 360 degree views.
The other access to the peak is from Highway 165. It is about 6 miles from the Cisneros Trailhead, a mile above Lake Isabel. Day parking is available at Lake Isabel for $3.00. Follow Cisneros Trail to the Saint Charles Trail junction. From the junction, the peak is a short climb up Saint Charles Trail.
One can also reach the peak from the trailhead on Highway 165, which is 2 miles south of Bishop Castle and 4 miles north of the entrance for Lake Isabel. This is a moderate way to do the climb.
Directions from Highway 165: On Highway 165, 2 miles south of Bishop Castle and 4 miles north of the entrance for Lake Isabel you will find the trail beginning. It heads southwest.
Directions from Lake Isabel Recreation Area: Another route is to begin at the Cisneros Trailhead, in Lake Isabel Recreation Area, across from Spruce and Ponderosa Group campgrounds.
Directions from Greenhorn Mountain Road: Take Forest Road 369 2.1 miles to where an old logging road takes off to the east. Most vehicles stop here as the road peters out after about a mile.
Mid-June through Mid-October
(NOTE: Weather dependent)