Quail Trail Loop is a 2.1 mile lightly trafficked loop trail located near Millbrae, CA and is rated as moderate. The trail is primarily used for hiking and trail running and is accessible year-round. 2.1 miles 370 feet Loop kid friendly hiking trail running Expand Map Sign up now to see this map! Reviews (0)Photos (1)Recordings (0)No one has reviewed this trail yet. Be the first!