A few suggestions. Note, we're not hard core, but rather intermediate older riders.
There's a BLM CG's right in the middle of the 18 Road trails north of Fruita. Ride right from your campsite.
map camping brochureOnce the mosquito season ebbs (after mid-July) camp up on the Grand Mesa and ride the Flowing Park Trail. It's a mountain bike/hiking trail. Up high, so cooler. Not a lot of up and down, but amazing wildflowers in the summer. Ride the Mesa Top Trail from CO 65 if you want a little more mileage. This trail was just completed late last year. It's a little more technical than Flowing Park.
map Also up in that area is the West Bench Trail. You'll pass the upper terminals of a couple of ski lifts on this trail.
mapLots of great mountain biking in the SW part of the state. Check out the Boggy Draw trails near Dolores.
info We camp at McPhee CG when we're there. Some FHU sites in this NFS CG. The nearby Anasazi Heritage Center is definitely worth a visit. The Sand Canyon Trail 12 miles west of Cortez is open to bikes. You'll ride by a variety of ruins along this trail. Treat them with respect.
mapThere is a load of MB around Durango. Check out
this link. North of town off of Molas Pass, heading SW on the Colorado is a great ride although it is high altitude (over 11,000' -- real Mountain biking!).
There are a number of newer singletracks above Salida.
Trail descriptions and maps If you're in shape and used to high altitude, the Monarch Crest Trail west of town takes off from the top of Monarch Pass and stays high. Eleven miles of the trail are above 11,000'. Several different shuttle services available out of Salida or Poncha Spring.
map and descriptionThis is just a sampling of what's available in Colorado. While you're in the vicinity, don't forget about Moab. They've added something like 120 miles of singletrack in the last three years. Check out
this link
Ken & Allison
2 Camping Cats (1 diabetic)
1996 4Runner, TRD Supercharger, Edelbrock headers
2007 Fleetwood Arcadia, Honda EU2000i
4 mountain bikes, 1 canoe, 4 tents, 8 sleeping bags, 2 backpacks
(You get the idea!)