Quail Loop Trail is a hiking trail in San Bruno, California. It is within Junipero Serra County Park. It is 1.2 miles long and begins at 250 feet altitude. Traveling the entire trail is 2.4 miles with a total elevation gain of 677 feet. The Willow Shelter Group Picnic Area picnic site is near the trailhead. There are also parkings, an information board, and drinking water. Along the trail there are restroom.