Location guide

Colorado Marathons

Colorado marathons make terrain part of the choice: altitude, canyon descents, mountain-town weekends, and city race days can each change how a goal pace feels. It is a state where course profile deserves a close read.

Showing all 8 races in this collection. Updated July 2026.

Notable race guides: Colorado Marathon, Denver Colfax Marathon, Aspen Valley Marathon, and Bound for Boston Marathon Denver.

  1. 01Aspen Valley MarathonSaturday, July 25, 2026Aspen, ColoradoBQAspen Valley Marathon gives runners a high-country Colorado road race with valley scenery, altitude, and a summer mountain-town calendar slot.GuideResults
  2. 02Bound for Boston Marathon DenverSunday, August 2, 2026Denver, ColoradoBQBound for Boston Denver is a purpose-built qualifier race, giving runners a controlled August marathon format rather than a large city festival.GuideResults
  3. 03Leadville Trail 100 RunSaturday, August 22, 2026Leadville, ColoradoLeadville Trail 100 Run is a high-altitude Colorado out-and-back from Leadville, crossing Hope Pass and topping out near 12,500 feet in thin air.GuideResults
  4. 04Colorado MarathonSunday, May 2, 2027Fort Collins, ColoradoBQColorado Marathon is a point-to-point descent through Poudre Canyon that draws runners chasing fast times, canyon views, and a serious Boston-qualifier setup.GuideResults
  5. 05Denver Colfax MarathonSunday, May 16, 2027Denver, ColoradoBQDenver Colfax Marathon is the big urban marathon in Denver, known for city landmarks, relay energy, and a race weekend that stretches well beyond the full.GuideResults
  6. 06Estes Park MarathonSunday, June 20, 2027Estes Park, ColoradoEstes Park Marathon is a high-altitude Colorado road race with Rocky Mountain views, early shuttles, a fast opening descent, and hard late climbs.GuideResults
  7. 07Hardrock 100Latest tracked: Friday, July 10, 2026Silverton, ColoradoHardrock 100 is a 101.8-mile San Juan Mountains loop from Silverton with 33,441 feet of climbing, high passes, and a remote alpine finish at the rock.GuideResults
  8. 08Leadville Trail MarathonLatest tracked: Saturday, June 27, 2026Leadville, ColoradoLeadville Trail Marathon is a high-altitude Colorado trail race to Mosquito Pass, with 26.4 rugged miles and a Leadville 100 qualifier draw.GuideResults