Park · Colorado
Leashed dogs welcome on the main dunes, the Mosca Pass Trail and Medano Creek. Sand gets dangerously hot in summer - walk it early or late.
The tallest dunes in North America against the Sangre de Cristos - and unusually for a national park, dogs are welcome on the main dune field.
The policy above is the standing rule of the agency that manages this land, as published on its own pages. Official page.
Rules change, and seasonal beach rules change twice a year. Check before a long drive.