Marathon · 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 21 races in this collection. Updated August 2026.

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

  1. 01Boulder Rez MarathonSaturday, August 15, 2026Boulder, ColoradoBoulder Rez Marathon circles reservoir-side dirt and trail with broad Flatirons views, offering a largely flat Colorado full with about 200 feet of gain.Guide
  2. 02Staunton Rocks! MarathonSaturday, August 22, 2026Pine, ColoradoStaunton Rocks! Marathon packs roughly 4,500 feet of climbing into 26.3 highly technical miles at high-elevation Staunton State Park near Pine.Guide
  3. 03Pikes Peak MarathonSunday, September 20, 2026Manitou Springs, ColoradoPikes Peak is a mountain marathon in the literal sense, climbing from Manitou Springs to 14,115 feet before a technical, quad-heavy descent on Barr Trail.GuideResults
  4. 04Boulderthon MarathonSunday, September 27, 2026Boulder, ColoradoBQEntry sells out every year for this Colorado marathon, which runs county back roads above 5,300 feet and finishes on the pedestrian Pearl Street Mall.GuideResults
  5. 05Colorado Springs MarathonSaturday, October 3, 2026Colorado Springs, ColoradoBQHigh-altitude racing from downtown Colorado Springs, with an out-and-back on the Greenway and Santa Fe trails at roughly 6,000 feet in early fall.Guide
  6. 06Windsor Marathon presented by Banner HealthSunday, October 4, 2026Windsor, ColoradoWindsor Marathon blends paved trail, road, golf-cart path and singletrack around Pelican Lakes, backed by broad Longs Peak views in northern Colorado.Guide
  7. 07Long View MarathonSaturday, October 10, 2026Fort Collins, ColoradoBQLong View Marathon links Fort Collins and Loveland on paved regional trails, with a nearly balanced profile and broad Front Range mountain views.GuideResults
  8. 08Breckenridge Road MarathonSunday, October 11, 2026Breckenridge, ColoradoBQBreckenridge Road Marathon starts high in Colorado's mountains and drops from Boreas Pass toward town, rewarding downhill strength and altitude readiness.GuideResults
  9. 09Durango MarathonSunday, October 11, 2026Durango, ColoradoHigh-altitude fall marathon in Durango, Colorado, run on paved roads between roughly 6,400 and 6,900 feet with a finish on the Animas River Trail.Guide
  10. 10Blue Sky Trail MarathonSaturday, October 17, 2026Fort Collins, ColoradoBlue Sky Trail Marathon covers 26.7 miles of Fort Collins singletrack, red-rock hogbacks, and dirt road with roughly 3,500 feet of climbing.GuideResults
  11. 11Rim Rock MarathonSunday, November 1, 2026Fruita, ColoradoRim Rock Marathon crosses Colorado National Monument on a high-desert road course with a long climb, sweeping canyon views, and an extended descent.GuideResults
  12. 12A Run Through Time Trail MarathonSaturday, March 13, 2027Salida, ColoradoA Run Through Time sends trail runners over high-desert singletrack above Salida, with roughly 4,000 feet of climbing and a generous cutoff.GuideResults
  13. 13Colorado 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
  14. 14Denver 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
  15. 15Spirit Trail Race MarathonSunday, May 30, 2027Buena Vista, ColoradoSpirit Trail Race Marathon runs 26.2 miles of Buena Vista singletrack from South Main Town Square, joining a community-minded Memorial Day weekend.Guide
  16. 16Steamboat MarathonSunday, June 6, 2027Steamboat Springs, ColoradoBQSteamboat Marathon descends from Hahn's Peak through Elk River ranchland, mixing mountain scenery, open roads, rollers, altitude, and a downtown finish.GuideResults
  17. 17Estes 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
  18. 18Bound for Boston Marathon DenverLatest tracked: Sunday, 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
  19. 19Aspen Valley MarathonLatest tracked: Saturday, 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
  20. 20Silverton Alpine MarathonLatest tracked: Saturday, July 18, 2026Silverton, ColoradoSilverton Alpine Marathon climbs the San Juan Mountains to nearly 12,930 feet, packing high altitude, jeep roads and mining history into 26.7 miles.GuideResults
  21. 21Leadville 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