This is a good intermediate ride. I’d say intermediate because of the elevation changes. If you are from the Midwest like me some of the climbs may be a bit more difficult to tackle. Start by heading up Landfill Road right across from Keystone Resort. Be watch out for big trucks heading up and down this road. Once at the top, go through the gates on the left and take the singletrack switchback that heads further up the mountain. This trail will eventually lead into the Oro Grande Trail.
The Oro Grande is a double track wide trail, smooth in some parts and rocky and jagged in others, with not much of an elevation change. From the Oro Grande you can get some great views of Lake Dillon. I believe if you stay on The Oro Grande Trail, it will join up with a few other trails and you can go as far as the Eisenhower Tunnel. It will also Branch off towards Silverthorne if you want to take the paved path back to Keystone.
After awhile on the Oro Grande, You’ll see a trailhead for the Tenderfoot Trail on the right side which switchbacks all the way up tenderfoot mountain. I am not sure if this trail is open to bikes or not. There are no signs posted which prohibit bikes and after doing some research I haven’t been able to find a definitive answer. But when I was there I headed up the trail. My Map image of the Tenderfoot Trail May not be very accurate but it gives a general idea of the trail. This trail weaves in and out of the woods as it switchbacks up Tenderfoot Mountain. It’s a pretty steep trail and can be difficult. I heard some loud thunder and didn’t want to get stuck out there in the rain so I headed back. The Downhill part was really sweet. Next time I’m out there I am going to try and make it further up Tenderfoot Mountain, as well as explore some of the trails that branch off Oro Grande.