The aspen trees there are changing from green to gold and orange between mid-September and early October, making for a mountain valley that is bright and colorful. This is the best time to see astonishing fall foliage while hiking, biking, golfing, or even fishing. Hike to the iconic Maroon Bells, surrounded by pristine National Forest lands, for some of the best pictures of the splendor of fall leaves you can get on camera. Cathedral Lake, American Lake, Hunter Creek and Crater Lake are other popular leaf-viewing spots.