Colorado Endurance Series

2015 Schedule is a work in progress.  Check back at a later date for final details.

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In the tradition of the Southwest Endurance Series (SWES), we present to you, the Colorado Endurance Series – a collection of the finest, self-supported, back country mountain bike endurance (solo effort) rides in Colorado!  We are the home of ultra-endurance mountain biking.

These are intended to be NON-COMMERCIAL, Recreational-Use Activities that are held on parts of USFS lands and every attempt is to be in compliance with USFS Special Use Rules and Regulations.


*COES Triple Crown Events!

We have partnered with local parties to develop events in Colorado and support the regional SWES.  This year we offer to you, an easier transition into endurance events with some 100-mile, dirt road events to start and finish the season – but still retaining the epic, hard core singletrack mountain adventures consistent with the SWES philosophy.

There are no fees, no prizes, but all attempts will be made to record your finish time in comparison to others (please cooperate here!).   In addition your mileage and time will need to be kept and reported by you as a way to make sure you followed the route as much as reasonably possible.  The goal is to finish these challenges and you set your own pace.  A start time and route is provided here and it is up to the participant to understand the route and also have full responsibility for their navigation and well being.   These are not group rides – they are solo efforts, although some people might do these as rides with friends or even other riders they meet at the start, along the route, or even before hand through the use of the SWES Email list.

Since the events are grassroots and will take participants to very rugged and remote places around the south-west, it should be understood that these are for experienced backcountry cyclists only.  If you question your ability to complete such an event, it is best that you consider another option before trying one of these.  Also, maps, gps devices, water filtration units, and other back country tools are a must.  Failure to bring along any of these might very well get you into trouble.  Therefore it is up to you – and you alone – to ensure your safety!!

The goal of the Colorado Endurance Series is to promote responsible grassroots endurance cycling in and around the south-west, and to provide a competitive outlet for the region’s current endurance racers – most of whom currently travel extensively in order to find competition.  The Colorado Endurance Series will help train current endurance riders and perhaps enhance success by south-west endurance riders in national events.

So if you have interest, come on out and join us, and do your part to contribute to this grassroots effort!  How can you do your part – you ask?  Well since these are all volunteer efforts – if you wish to improve upon the events or series, please step forward and do so!  It’s that simple and much better than complaining.

Also, if you wish to host an event please contact the Colorado Endurance Series Coordinator and we will add your event to the website. We are always looking for new and exciting routes to add to our existing Colorado Endurance Series events.

Look for more information to come as the events occur, and feel freely to comment and provide constructive feedback.

About SWES

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11 responses to “Colorado Endurance Series

  • Annie sewell

    My name is Annie Sewell, and I had requested permission to borrow your rules and regs to start up our foot race series here in Pagosa Springs, CO. you all said yes, and now we at the Pagosa Area Run Club have launched our new word press site–at your suggestion–and are wondering if you would link us into your site where ever you deem suitable.

    ALSO, we would love to have all of you out for som sweet trail runs in Pagosa! Great cross training!

    our site is

    let me know what else you need, and thanks again for the valuable help!!!


  • nmes

    Sure thing Annie – a link has been added. Good luck! Also will any of the distances be greater than 10k?

  • Thomas Ray

    Looking to put together an event in late August in Aspen,who do i need to contact.

  • Ben Welnak

    Another one to add to the schedule:
    Starting and ending near the Greenland Open Space just north of Colorado Springs. 150 miles (and about 145 miles are dirt) of soul crushing rollers.

    We’ll continue to update it as we scout it out and solidify a date.
    Looking like March 31 or April 7, 2012.

    If you have any questions, let me know!

  • brian behn

    How do I contact the coordinator for a possible new event?

  • Adam Shaw

    Anyone considering a resurrection of Montezuma’s Revenge under this format? It is still the original and the gnarliest!

    • SWES

      Hi Adam – If you want to put on an event then do so and we can add it to the series. This is all volunteer – if you want something then set it up for others to enjoy. ;-) Thanks for your interest.

      • Adam Shaw

        I personally have been considering that even with limited personal time. If I can get a lot of interest (at least 25 ) and if someone would like to help me understand all the forest service laws / rules, I could see doing it. I do not want to do an “official” race though. I also hold the utmost respect for Byron the original organizer and have no intention s of disfranchising on his rights to the original race. I just wish the spirit of the event would continue. For those that are not familiar with the Revenge it was a solo only 24 hour mountain bike race that looped in and out of Montezuma Colorado. All loops are different and it was to see how far you can go in 24 hours including a summit of Grays peak. Obviously special consideration or relocation of start / finish area would be necessary out of respect of Montezuma’s residents.

  • Kris


    My name is Kris and I’ll be heading in for the Dirty Double next month from California. This will be my longest “race” as a messenger and hopefully a personal best in endurance. As of now plans are to ride from Denver to Salida with my European counterpart (Stefan Vis) for the Double followed by some serious miles to explore and ultimately get back to Denver. Though passage each way would be awesome for me (and paid for!) I’m hoping that at least heading down for the event I can scrounge a way back in time for my flight home! Any help/guidance would be more than welcomed being a stranger and If no takers no worries just trying to survive the best while out there!


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