The National Park Service is soliciting proposals for up to 37 concession contracts to provide guided interpretive saddle and pack stock tours within Yellowstone National Park. The effective date for the new contracts is expected to be May 1, 2027. All services are to be performed within Yellowstone National Park. The solicitation involves mandatory deadlines for questions and a notice of intent to propose prior to the final electronic proposal submission. Proposals must be submitted electronically through a specific Microsoft Teams site, and hardcopy submissions will not be accepted.