Anglers 16 and older can buy their Colorado fishing license online at the Colorado Parks and Wildlife website. Anglers 18 to 64 interested in buying one or more licenses must additionally purchase a $10 habitat stamp that lasts through the entire season, or a lifetime stamp costing $300.25. This stamp provides you access to federal lands. You can also buy a license from a retail purchasing agent or over the phone at 1-800-244-5613.
Check out these Littleton, CO fishing resources: