The trailhead is located at the fork where Mt Lowe Road, Middle Sam Merrill Trail
, and the trail to Inspiration Point are. From this intersection, Idlehour Trail goes east and down. This is some nice singletrack and is a nice alternative to the other trails around. There is a nice climb out from Idlehour Campground, and the trail can get thin and overgrown. Use the Mt. Wilson Toll Road
, through Henninger Flats
, to exit onto Pinecrest Drive in Altadena.