You can always check on their website before you go. Changes every year depending on moisture, sunlight, and temp. Sometimes a freeze can happen in mid September and the leaves go straight to brown and fall off. Northen NM is usually pretty dang good. Chama, Tres Piedra, Taos, Eagle Nest, Red River, Cimmarron. The Valle Vidal is incredible. Southern CO I like the drive from Dolores to Telluride better. You can also drive up the West Dolores and skirt the Lizard Head wilderness and come right out at Rico then drive to Telluride. If you have a jeep or SxS then drive from Sliverton to Lake City is pretty incredible as well. There are also a few roads to take from Rico over the mountain to Durango Mountain Resort (Purgatory ski area).