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Upcoming marathons in Colorado

May 2026

  1. Colorado Marathon
    Marathon, Half Marathon, 10K, 5K
    Fort Collins, CO, USA
  2. Colfax Marathon
    Marathon, Half Marathon, 10M, 5K
    Denver, CO, USA
  3. Boulder Boulder
    10K
    Boulder, CO, USA

June 2026

  1. Steamboat Marathon
    Marathon, Half Marathon, 10K
    Steamboat Springs, CO, USA
  2. Estes Park Marathon
    Marathon, Half Marathon, 5K
    Estes Park, CO, USA
  3. Leadville Trail Marathon
    Marathon, Half Marathon
    Leadville, CO, USA

July 2026

  1. Hardrock 100
    100 Mile
    Silverton, CO, USA
  2. Silverton Alpine Marathon
    Marathon, 50K, 8M
    Silverton, CO, USA
  3. Aspen Valley Marathon
    Marathon, Half Marathon, 5K
    Basalt, CO, USA

August 2026

  1. Boulder Rez Marathon
    Marathon, 3/4 Marathon, Half Marathon, 10K
    Boulder, CO, USA
  2. Mt. Sneffels Marathon
    Half Marathon, 10K
    Ouray, CO, USA
  3. Leadville Trail 100
    100 Mile
    Leadville, CO, USA
  4. Staunton Rocks! Marathon
    Marathon, Half Marathon
    Pine, CO, USA

September 2026

  1. All-Out Fallfest Half Marathon
    Half Marathon, 10K, 5K
    Westminster, CO, USA
  2. Colorado Fall Equinox Marathon
    Marathon, Half Marathon, 5M
    Fort Collins, CO, USA
  3. Pikes Peak Marathon
    Marathon, Half Marathon
    Manitou Springs, CO, USA
  4. Boulderthon Marathon
    Marathon, Half Marathon, 10K, 5K
    Boulder, CO, USA

October 2026

  1. Colorado Springs Marathon
    Marathon, Half Marathon, 5K
    Colorado Springs, CO, USA
  2. Windsor Marathon
    Marathon, Half Marathon, 10K, 5K
    Windsor, CO, USA
  3. Breckenridge Road Marathon
    Marathon, Half Marathon, 10K
    Breckenridge, CO, USA
  4. Long View Marathon
    Marathon, Half Marathon, 5K
    Loveland, CO, USA
  5. Blue Sky Marathon
    Marathon, Half Marathon
    Fort Collins, CO, USA

April 2026

  1. Runs With Scissors Races
    50K, Marathon, Half Marathon
    Brighton, CO, USA