Easily accessed from Keystone, the Frey Gulch mountain biking loop travels along the lower slopes of Tenderfoot Mountain — across Highway 6 from the resort — and up aspen-lined Frey Gulch.

Know Before You Go: The trail is usually dry by June and sometimes even by late May. Expect horse traffic from Keystone Stables. Always pull over and let them pass. Frey Gulch is full of aspens, making this a colorful fall ride.

Parking: From Interstate 70, follow Highway 6 east to Keystone. Beyond the stoplight, turn left onto an unnamed road just across from Keystone Lodge. Park in the large lot on the left. If this lot is full, drive a mile farther up the highway and use the skier parking lots off Gondola Road.

Description: Go right onto the highway and descend about a mile, passing through the stoplight. Go past the landfill road and turn right on a singletrack just before the bridge. Climb this trail until you reach the landfill gate. Cross the landfill road and climb the singletrack that leads back to the landfill road. Turn right onto the road and pedal uphill to another road. Go right, passing a trail on the left, then a power station. Ride by a gate and climb into the trees. Descend, crossing a cattle guard and passing small side roads. At 3.2 miles, just beyond a creek, pass a narrow road on the left, then turn left onto the next larger road at a three-way junction. Pedal up aspen-filled Frey Gulch, passing several side roads and veering right at a four-way junction. The road gets rougher as it travels deeper into the forest and across a creek. Turn right at a junction (the left forks climbs steeply up Tenderfoot Mountain) and climb a short distance. Beyond a creek the road fades out near some cabin remains. Return along the same route and turn left onto the main road at the bottom of the gulch. Climb, curving left through a logged area. Drop to and cross a tiny creek at 6.9 miles. Turn right immediately (the main road eventually splits into several dead-end logging roads), ride by a dirt berm and onto a trail. Descend along the edge of a logged area, following the lower (right-hand) trail into a forested drainage. Swing left, picking your way through some rocky sections and descend along a hillside. Switchback down to a wider trail and follow it through the trees to the paved Saints John Road. Turn left and ride out to the highway. Turn right and descend to the parking lot.