As summer comes to an end, the aspen leaves will quickly begin to lighten.  The best time for fall colors in Colorado is from mid-September thru mid-October.  Peak color first begins in the mountains of northern Colorado and usually lasts about 2 weekends.  Each week the bright golden leaves push further south across Colorado.  The central mountains usually peak the last 2 weekends in September while southern Colorado usually reaches the brightest colors in the first half of October.  As you are chasing the vibrant fall foliage, remember that a little change in elevation or latitude can make a big difference.  Read More Here