Colorado Marathon

Colorado Marathon is held in Colorado Springs, Colorado, on May 2, 2027, with four formats: a marathon (26.2 miles), a half marathon (13.1 miles), a 10K, and a 5K. The event runs at altitude, in a setting shaped by cliffs and the surrounding mountains, with dense forest along the way. It is a demanding day that combines physical effort with a landscape that is unmistakably Colorado. No start times have been published.

Altitude is the factor to plan around if you live near sea level. Thinner air costs you time at any distance, so set a target that is slower than your flat-course equivalent and run the first half by effort, not by pace. The marathon calls for the usual 16- to 18-week build with a weekly long run, but if you are travelling in, either arrive a couple of days before the race or spend two to three weeks acclimatizing; the middle ground tends to be the worst option.