Free Fly Tying Demos | St. Peter's Fly Shop is a full service pro fly fishing shop with the best selection of fly fishing products and guided fly fishing trips in Northern Colorado. Located in Ft. Collins Colorado we are conveniently positioned in close proximity to a number of world class waters including; Cache la Poudre River, Big Thompson River, Rocky Mountain National Park, Estes Park, North Platte River(Upper North Platte, Gray Reef, and Miracle Mile), and many stillwaters.