Discover and explore Colorado’s unique trail experiences with the Colorado Trail Explorer (COTREX). Available for free and without ads, COTREX offers the most comprehensive official trail map in the state and is a collaborative effort spanning over 230 trail managers. View trails by allowed uses on the map, browse featured routes, download offline maps, view closures, alerts, wildfire boundaries and avalanche forecasts, record trips and notes in the field, and share your experiences with the co