Colorado Marathons
23 upcoming marathons across Colorado, updated nightly. Want radius search and maps? Open these in the Race Finder.
When to race: marathons in Colorado
Colorado has 23 upcoming marathons over the next 12 months. October is the busiest month for them, with 7. Most are around Fort Collins, Denver, Colorado Springs. The next one is Denver, CO Galloway Training Program on September 5 in Denver.
- Sep 20265 races
- Oct 20267 races
- Jan 20271 race
- Mar 20271 race
- May 20274 races
- Jun 20274 races
- Aug 20271 race
September 2026
- Sat 9/5Denver, CO Galloway Training ProgramDenver, CO · Marathon · Half Marathon · from $91 · register ↗
- Sat 9/12Steele Trap Trail RunLoma, CO · Marathon · Trail · from $50 · registration closed · register ↗
- Sun 9/20Pikes Peak MarathonManitou Springs, CO · Marathon · from $100 · register ↗
- Sun 9/27Girls on the Run Rockies Boulderthon SoleMates 2026Boulder, CO · Marathon · Half Marathon · 10K · from $25 · register ↗
- Sun 9/27Team CKF Running SeriesAspen, CO · Marathon · register ↗
October 2026
- Sat 10/3Colorado Springs Marathon, Half, 5K, and Kids KColorado Springs, CO · Marathon · Half Marathon · 5K · 1K · from $8 · register ↗
- Sat 10/3West Elk ChallengeCrawford, CO · Marathon · 30K · register ↗
- Sun 10/4Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile RunWindsor, CO · Marathon · Half Marathon · 10K · 5K · 1 Mile · from $20 · register ↗
- Sat 10/10Breckenridge RunFestBreckenridge, CO · Marathon · Half Marathon · 10K · 5K · 1 Mile · from $25 · register ↗
- Sat 10/10The Long View MarathonFort Collins, CO · Marathon · Half Marathon · 5K · from $35 · register ↗
- Sun 10/11Durango MarathonDurango, CO · Marathon · Half Marathon · from $20 · register ↗
- Sat 10/17Blue Sky Trail Marathon & Half MarathonFort Collins, CO · 26.7 Miles · 13.8 Miles · Trail · from $90 · register ↗
January 2027
- Sat 1/30Alley LoopCrested Butte, CO · Marathon · Half Marathon · 10K · 5K · 3K · from $25 · registration closed · register ↗
March 2027
- Sat 3/1322nd Annual Run Through Time Trail Marathon and Half MarathonSalida, CO · Marathon · Half Marathon · 2 Mile · Trail · registration closed · register ↗
May 2027
- Sun 5/2The Colorado MarathonFort Collins, CO · Marathon · Half Marathon · 10K · 5K · from $40 · register ↗
- Sat 5/8Valkyrie Trail RaceColorado Springs, CO · 50K · Marathon · 30K · Half Marathon · 8 Miles · Trail · register ↗
- Sat 5/15Endure Trail RunsDivide, CO · 6.8 Miles · 14.1 Miles · 26.5 Miles · Trail · from $60 · registration closed · register ↗
- Sun 5/162027 Denver Colfax MarathonDENVER, CO · Marathon · 5K · Half Marathon · 10 Mile · register ↗
June 2027
- Sat 6/5Weld Your Mettle Running FestivalEaton, CO · 50 Mile · 100K · 4.3 Miles · 14 Miles · Marathon · from $35 · register ↗
- Sun 6/6The Steamboat MarathonSteamboat Springs, CO · Marathon · Half Marathon · 10K · 0.5 Miles · from $65 · registration closed · register ↗
- Sun 6/20Estes Park Marathon & Half Marathon 2027Estes Park, CO · 7 Miles · 5 Miles · Marathon · Half Marathon · register ↗
- Fri 6/25Race in the Clouds - Alma Dirt Festival 2027Alma, CO · 38 Miles · Marathon · Half Marathon · 22 Miles · 10K · from $10 · register ↗
August 2027
- Sun 8/1Bound for Boston Marathon & Half Marathon - DenverDenver, CO · Marathon · Half Marathon · from $25 · registration closed · register ↗
Planning a race
- Boston qualifying timesthe BQ standard for every age group, and what the cutoff has really been
- Choosing a first marathonwhat to look for in a debut race, and what to avoid
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