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Happy Jack Endurance Races will be taking a hiatus in 2015.  
We sincerely thank you for your interest in an event which we find very special and hope to see you in 2016!


Run 24, 12, or 6 hours as a team or a solo runner (or try 100 miles!) through the beautiful Happy Jack area of the Medicine Bow National Forest in rugged Wyoming.  (Like our Facebook event page for up-to-date announcements and results!)

Race Summary

All events occur on a challenging 6 mile loop, run almost entirely on forest trails, with approximately 725 feet of elevation gain per loop.  Each loop has access to the lively basecamp, which will serve hot food all night, and the upper fully-stocked aid station located at 8800′.  While this race will prove to be a challenge to everyone, the ample support and frequent access to basecamp will give all levels of runners an excellent chance of reaching their goals.  In addition, teams will experience the camaraderie and  competition of an all-night race.  Beautiful starry nights, wild flowers, beaver ponds, rugged forest – Wyoming!  Located less than 3 hours north of Denver International Airport, the race is easily accessible from many points in the west.   Free camping is available at the starting line Friday and Saturday nights.  (Tents and small campers only, as space is limited.)


Race Categories  

  • 100 Mile (Solo, with a 30-hour limit)
  • 24 Hour 
    • Solo
    • Duo Relay (2 teammates)
    • Extreme Team Relay (3-5 teammates)
    • Open Division Relay (6-10 teammates)
  • 12 Hour 
    • Solo
    • Duo Relay (2 teammates)
  • 6 Hour Night Run (Solo)



Saturday, June 28th

  • 7:00-8:30am Racer Check-in and Registration
  • 8:45am Pre-Race Briefing
  • 9:00am Race Start (All races except 6-Hour)
  • 6:00pm Race Start (6-Hour)
  • 9:00pm End of 12-Hour Race

Sunday, June 29th

  • 12:00am End of 6-Hour Race
  • 9:00am End of 24-Hour Race
  • 3:00pm Cut-off for 100-Mile Race