Racing Underground brings you an amazing half marathon this spring! The Three Creeks Half Marathon features a half marathon course that is flat, fast and scenic!

Travel on foot through some of the most beautiful parts of Cherry Creek State Park, with a total combined elevation gain of only 291 feet spread out over 13.1 miles as the course follows the banks of Cherry Creek, Windmill Creek, and Cottonwood Creek on a mix of road, paved running trail, and wide dirt trails.

We hope to see you at the 13th annual Three Creeks Half this April!

Darrin, Jill,and the Racing Underground Crew

BACK IN 2026 - 2-person Half Marathon Relay!!! Each team member runs half of the course. The exchange zone is at the 6.5 mile aid station. A shuttle van will transport all runners who are running the second half of the course to the exchange zone and will drive all first half runners back to the start/finish line. All team members will receive a gender-specific race shirt, free race photo downloads, tasty quesadillas fresh off the griddle, and a finisher medal with the option to have the back engraved for free! Awards will be presented to the first place male, female, and co-ed teams. For planning purposes, the second half of the course has slightly more uphill than the first.

04-05-2026, 07:15 am - 01:15 pm