North of San Francisco and southwest of San Anselmo, the Mt Baldy Loop is a 12.5 mile mountain biking loop.
To reach the Mt Baldy Loop mountain biking trailhead from US101, use Exit 450. Head west on Sir Francis Drake Boulevard. Turn left on College Avenue. Turn right on Woodland Road. Turn right on Goodhill Road. After climbing, turn left on Crown Road to the start of the trail.
Overall, Mt Baldy Loop is the 128th most popular mountain bike trail of all 132 mountain biking rides in California.