South of Hailey, the Sonners Flat Loop is an 11.5 mile (300) route through BLM lands.
To reach the mountain biking trailhead from Ketchum, head south on SR75 for 34 miles. Turn left heading east on Picabo Desert Road for 0.8 miles. The trailhead parking area is near an old quarry loading area.
Overall, Sonners Flat Loop Trail is the 32nd most popular mountain bike trail of all 63 mountain biking rides in Idaho.