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Colorado Trail Explorer (COTREX)
Colorado Trail Explorer (COTREX)
​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​ Visit COTREX Online 

​​​​​​​​​​​​​​​​​​​​We’re mapping Colorado’s Trails

Discover and explore Colorado’s unique trail experiences with the Colorado Trail Explorer​. Available for free, COTREX offers the most comprehensive trail map available for the state and is built atop data from over 230 trail managers.

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Explore Today 
Visit COTREX Online Download iOS App Download iOS App

View trails by allowed uses on the map, browse featured routes, download offline maps, record trips and notes in the field, complete challenges to earn badges, and share your experiences with the community. COTREX is your gateway into Colorado’s magnificent outdoors.

COTREX App Features​​

Discover Trails & Featured Routes

App Route Map Screenshot Example
  • Browse or search to find trails and Feature Routes that match your activities or interests.

  • Change activity type to dynamically filter trails on the map.

  • NEW Fire Alert Feature - daily wildfire and prescribed burn updates from trusted sources to help you stay safe.

Offline Maps

  • No cell coverage? No problem! Download maps ahead of time for a continuous experience that doesn’t depend on your network.

  • Increased opportunities for discovering new trails;

  • COTREX offline maps are lightweight in size and easy to download.

Record Trips & Field Notes

App example screenshot recording trips
  • Capture the details of your outdoor experiences by recording Trips.

  • Go beyond simple photos by taking and classifying rich Field Notes along the way. Choose from 45,000+ classifications that include trail conditions, species, rocks and minerals, historic places, points of interest, and much more.

  • Seamlessly sync activity recorded on your devices with the web.

Complete Challenges to Earn Badges

App screenshot challenges example

By recording and classifying Field Notes, you can complete Challenges and earn Badges for your profile.

Share with the Community

  • Inform and inspire the entire COTREX community by sharing your Trips and Field Notes publicly or submitting Trip Reports.

  • View activity feeds for all users or just the ones you follow.

  • By sharing your experiences, you also help to inform trail managers about current conditions on the ground.

Colorado Parks and Wildlife, Department of Natural Resources, Natural Atlas Logos 

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