Sunrise Marathon 5K/10K/13.1 DENVER/AURORA

Sunrise Marathon 5K/10K/13.1 DENVER/AURORA is held in Centennial, Colorado, on December 12, 2026. The half marathon (13.1 miles), the 10K, the 5K and a one-mile family fun run all start at 7:30 a.m., built around running into the sunrise on a scenic course. Optional timing is offered, and athletes get a performance race shirt, a finisher medal and a digital training pack.

Run it as a negative split and you will enjoy it far more. On the half, hold the first four miles a touch slower than goal pace, settle into rhythm through the middle, then spend whatever is left over the closing miles. That plan only works if the long runs happened: figure on ten to twelve weeks with one long run a week for the 13.1. The 10K rewards the same patience over a shorter span, and the 5K is simply about getting the first mile right.