South of Sun Valley, the Greenhorn Gulch / Mahoney Creek loop is a 10.5 mile horseback riding route climbing 2,000 feet. The route combines the trail up Mahoney Creek and returns via the Greenhorn Creek Trail. An alternate return is via Imperial Gulch.
To reach the horseback riding trailhead from Ketchum, head south on SR75 for 5.5 miles. Turn right heading west on Greenhorn Gulch Road for 3.5 miles to the trailhead parking area.
Overall, Greenhorn Gulch / Imperial Gulch is the 13th most popular horse trail of all 56 horseback rides in Idaho.