L.A.'s Mountain Biking Trails Idlehour Trail Loop Click Here for Map [Park at the Mt.Wilson Fire road trailhead] 210 Freeway exit Altadena Dr. and head towards the mountains. Turn right on Crescent Drive and another right on Pinecrest Dr. Please observe the strict parking regulations e.g. no parking weekends / 2 hour parking weekdays. Ride the streets for approx 2 miles. Turn right on Altadena Drive and another right on Lake Ave to the corner of Loma Alta Drive. Advanced Current Trail Rating = 9 Click Here to Rate this Trail Click Here to Return to Trails Home