Colorado Trail Explorer 4+

Colorado's Official Trail Map

State of Colorado - OIT

Designed for iPad

    • 4.3 • 192 Ratings
    • Free



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.

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.


– 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.


– No cell coverage? No problem! Download maps ahead of time for a continuous experience that doesn’t depend on your network.
– COTREX offline maps are lightweight in size and easy to download.


– 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.


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


– 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.


The Colorado Trail Explorer endeavors to map every trail in the state of Colorado in support of the Colorado the Beautiful Initiative. COTREX connects people, trails, and technology by coordinating the efforts of federal, state, county, and local agencies to create a comprehensive repository of recreational trails for public use.

This project is led by Colorado Parks and Wildlife (CPW) and Department of Natural Resources, but is only made possible through partnerships with organizations at every level statewide. COTREX represents a seamless network of trails managed by over 230 land managers.


[Battery Life] We do everything we can to make the app low power when recording, but GPS is notorious for reducing battery life

Privacy Policy:

What’s New

Version 1.5.4

- Fixed crash affecting devices using iOS 12

Ratings and Reviews

4.3 out of 5
192 Ratings

192 Ratings

Locologo94 ,

Been Waiting for This!

Finally a trail navigating app that is run by the people that control the trails! I only just downloaded the app, I will update this review when I take it out and use it around the Taylor Park area. Huge props for actually having the trail names on here, instead of just the trail numbers. That one feature makes it better than the other apps that I have been using for trail navigation. One suggestion to the developers: take the community aspect of this app to the next level. Make it to where you can add friends and leave comments on each trail that can either be seen by friends only, or the public. This would enable people to warn trail goers of dangers (rockslide, fallen trees, etc.). Also make it to where you can form a group. Say you are riding with 4 other people that each have their own OHV/ATV. You could share a pin/waypoint with the whole group so that if anyone gets separated, they would know where to go. Add the ability to send a distress call, that can be seen be sent to all nearby app users as a push notification. (For example: “Ran out of gas”, or “rollover, broken leg, need help”). This app is already amazing, but also has so much more potential! Thanks devs!

Developer Response ,

Thanks for the suggestions – we’re always evaluating ways to improve the experience! One thing you can do today is post Trip Reports, associated to either existing trails or a Trip you’ve recorded, and tag specific users for notification. You can also tag specific users on your own Trips, Field Notes, and Custom Routes. Finally, each of those can also have visibility set to Public, Private, Unlisted, or Tagged Users. Trip Reports will always be publicly visible, however. Don’t hesitate to email us anytime at if you have other questions or suggestions.

Janiebobani ,

Best hiking app for Colorado

I have used almost every hiking app. This is the best for CO. By tapping the trailhead icon you can get directions, see miles and elevation, see exact weather conditions after scrolling down, (Temp, dew point, wind, windchill, direction of wind, surface wind and gusts, rain, snow, lightening, thunder…). Many other apps limit your trails to THIER configuration. With this app you can connect trails and make your own, see elevation gain, see dispersed camping areas, easily see water sources, etc. It takes a little bit to see all that this app can do, just keep clicking and exploring. I rarely use the filter to look for specific types of trails. I just use the map and look for established trails and trails I can connect together on my own. Links take you directly to the trail manager or park service. Some trails are managed by different counties or are in multiple forests/state parks; knowing what jurisdictions you are in comes in handy for emergency communications and/or rules, closures, etc. I have made over 60 trails and keep making more, love this app!

Ida's Mom ,

I used to love this app…

Okay, so after I wrote the scathing review, I found the red button - which does not show up on opening page, you must press the directional arrow in lower menu bar to find it - & recorded my walks. Two days in a row the same 5.6 mile trail I’ve walked for two years is now 7.1 & 7.2 miles respectively. I am comparing this to another mapping app which has always read within 0.2 miles of COTREX, so I know the original mileage was correct. Much as I’d like to brag about walking 7 miles daily before breakfast, that’s just not accurate. I always carry my phone in side pants pocket so there is no chance of extra movement being the sudden difference. Please fix this!!!
…until the recent update that removed the Record A Trip feature. I hike daily with my dog near our home & thus am familiar with the official trails. We often go off trail through the woods, sometimes using COTREX to stay oriented & always to keep track of our route. Now all that’s available is the Create Route feature which makes assumptions about where I want to go based on input of only 2 location points, completely useless. After I transfer my 190 recorded trips to my computer, I’ll be deleting this app. So disappointed!

Developer Response ,

Hello, and thank you for your feedback. Trip recording is still available but it has been moved to the new navigation tab (the center tab). This tab is totally devoted to the best experience for being on the trails. Press the big red record button while on this tab to start recording a trip.

App Privacy

The developer, State of Colorado - OIT, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Linked to You

The following data may be collected and linked to your identity:

  • Contact Info
  • Search History
  • Identifiers
  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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