Colorado Marathons
13 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 13 upcoming marathons over the next 12 months. Among complete calendar months, May 2027 has the most listed races, with 4. Most are around Colorado Springs, Crested Butte, Aspen. The next one is Alley Loop on January 30 in Crested Butte.
- Jan 20271 race
- Mar 20272 races
- May 20274 races
- Jun 20274 races
- Aug 20271 race
- Oct 20271 race
January 2027
- Sat 1/30Alley LoopCrested Butte, CO · Marathon · Half Marathon · 10K · 5K · 3K · from $25 · register ↗
March 2027
- Sun 3/7Team CKF Running SeriesAspen, CO · Marathon · register ↗
- Sat 3/1322nd Annual Run Through Time Trail Marathon and Half MarathonSalida, CO · Marathon · Half Marathon · 2 Mile · Trail · from $15 · 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 · 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 $26 · registration closed · register ↗
October 2027
- Sat 10/2Colorado Springs Marathon, Half, 5K, and Kids KColorado Springs, CO · Marathon · Half Marathon · 5K · 1K · from $8 · 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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