Northwest of Sun Valley, the Adams Gulch Trail System is a 15+ mile singletrack trail network perfect for mountain biking. This close-to-town ride has a variety of combinations with a maximum descent of 1,400 feet. Over the years, this trail system has expanded from the popular Adams Gulch Loop and Adams Gulch Trail to include the Eve's Trail, Sunnyside Trail, Shadyside Trail, Citizens Trail and Lane Trail. During early to mid-June, the wildflowers lining the trails are spectacular.
To reach the Adams Gulch mountain biking trailhead from Ketchum, head north on SR75 for about a mile to an unsigned road on the west side of the road (there is a National Forest Access sign). Turn left heading west on winding unsigned road across the river. After about 0.5 miles, there is a sign for Adams Gulch Road to the left which continues west into the National Forest property. The trailhead parking area is at the end of the road.
The popular Adams Gulch Loop is a 10.4 mile loop. Start by continuing to ride west up the valley on the old Adams Gulch Road, which has been recently reclaimed to a singletrack, for 3.4 miles. While the old doubletrack does continue southwest, turn right heading northwest on Adams Gulch Loop climbing up. Follow this trail to the east for 7 miles back to the trailhead.
In addition to the Adams Gulch Trail, the other trails in the Adams Gulch Trail System include the Eve's Gulch Trail (8.1 miles), the Forbidden Fruit Trail (1 mile), the Griffin Butte Connector (1.5 miles), the Citizen's Trail (1.2 miles), and the Shadyside Trail (1.6 miles).
Overall, Adams Gulch is the 1st most popular mountain bike trail of all 63 mountain biking in Idaho.