Since Colorado is a huge hunting destination for a variety of hunters, the regulations will vary depending on what you intend to hunt. Access Colorado's hunting brochures online to view the various regulations for the type of animal you'd like to hunt. The brochures lay out the regulations for big game hunting, bighorn sheep and mountain goat hunting, mountain lion hunting, small game and waterfowl hunting, and turkey hunting.
Check out these Aspen, CO Hunting resources: