Yes, all guests aged 16 and older are required to hold a valid Colorado fishing license, even on a guided trip inside Rocky Mountain National Park. Licenses are not included in the trip price and must be purchased separately before your trip.
Where to buy: Online through Colorado Parks and Wildlife at cpw.state.co.us
Good news: Fly Fish Estes Park handles your RMNP timed-entry reservation for you when you book — no separate park permit is needed on the day of your trip.