Healthy Kids Outdoors Act of 2015

Authorizes the Department of the Interior to issue an eligible entity a cooperative agreement for each state for the development, implementation, and updating of a five-year Healthy Kids Outdoors State Strategy designed to encourage people in the United States (especially children, youth, and families) to be physically active outdoors.

Requires an entity that receives funding to: (1) update the State Strategy at least once every five years, and (2) provide a 25% match through in-kind contributions or cash.

Requires State Strategies to provide for subgrants to local partners to implement the state strategy through at at least one of specified program activities.

Directs the President to issue a national strategy for encouraging people to be physically active outdoors.

Directs Interior and the Department of Health and Human Services to carry out a study of national significance on the health impacts of the national strategy and State Strategies.

Requires Interior to provide technical assistance to eligible entities and local partners, and disseminate best practices that emerge from the strategies funded by this Act.