The Jimmy Keen Trail is a meandering singletrack in the La Sal Mountains east of Moab. It's 7.7 miles long and requires at least upper-intermediate technical skills. Because of the altitude, this trail's season is mid-June to mid-October. Most riders will use this trail as an alternative route for the Whole Enchilada ride.
At the top, Jimmy Keen starts at the highest point of the paved La Sal Loop road at 8300 feet elevation. The trail drops away from the parking turnout for the Castle Valley viewpoint in the National Forest on the western slope of the La Sals.
If you're coming downhill from the Hazard County trail, you can either turn right at the pavement and go 1/10 mile to the viewpoint, or go straight across and take Kokopelli 1/10 mile to where the trail crosses.
This trail is a nice stand-alone ride, but its major use will be as an alternative descending route while riding the Whole Enchilada . Your choice is 1.8 miles of dirt road on Kokopelli to reach the Upper Porcupine Singletrack (UPS) , or 7.7 miles of fun singletrack on Jimmy Keen. If your goal is to get back to town as quickly as possible, take Kokopelli. If you came to Moab to ride your bike, go with Jimmy.
You'll encounter quite a few fences, all with ride-over cattle-extruders. Eight, ten, twelve? I quit counting. This area is summer range for beef.
My ride was a frigid morning in mid-November, so the hoof-prints were frozen solid. The bumpy zones were less than 1/4 mile in all.
Straight across from you is the UPS (Upper Porcupine Singletrack) trail.
If you'll be heading back to your car on the La Sal Loop road, at least check out the UPS trail. You can go down-and-back, or circle back via the Sand Flats Road and Kokopelli (see the big map).
From the north (about 33 miles): At the Colorado River (2.4 miles north of Center Street in Moab), turn east on highway 128. Drive along the Colorado for 15 miles. Turn right on the paved Castle Valley - La Sal Loop road. Zero your trip odometer. At mile 10.5, turn right (south) on the La Sal Loop Road. Drive another 6 miles to the viewpoint on the right side of the road.