Colorado 13Er Half Marathon 2026
The Colorado 13Er Half Marathon 2026 takes place on June 7, 2026, in Louisville, Colorado, with the start and finish located at Home Depot, 1200 Dillon Road. Participants can expect typical early summer weather in Louisville, which often features mild to warm temperatures and clear skies, though runners should prepare for varying conditions characteristic of the Colorado Front Range. This mixed-terrain event offers a scenic, low-elevation double loop course that combines crushed gravel on the Davidson Mesa Trail and Harper Lake Loop with asphalt and concrete sections, providing views of the Flatirons and the Front Range.
What distances are offered at this event?
- →13.1 miles (13er): A double loop course consisting of approximately 9 miles of crushed gravel and 4 miles of asphalt/concrete.
- →10k: A course featuring asphalt, concrete, and crushed gravel with out-and-back elements.
- →5k: An out-and-back course on asphalt, concrete, and crushed gravel.
What is the course layout for the 13er?
The 13.1-mile course begins with a one-mile uphill climb to a flat mesa. Runners proceed counterclockwise north to Harper Lake, loop the lake (approximately 1 mile), and return to the mesa's north side before completing a second identical loop. The route is designed to be runnable with minimal elevation gain. An interactive map is available via MapMyRun ↗.
What support and amenities are provided during the races?
- →13er participants receive 10 aid station passes providing water and electrolytes, with additional gels provided at miles 5 and 10.5.
- →13er participants receive 5 restroom passes.
- →Shorter races include fewer aid and restroom stations.
- →Water is provided in cups at aid stations (not at the finish line), and a bottle drop zone is available.
Are there any specific rules regarding strollers or pets?
- →Strollers are permitted, though the use of jogging strollers is recommended.
- →Dogs are not allowed to participate in the event.
What is the time limit for the half marathon?
- →The 13er has a 3:30 course cutoff, which requires maintaining a pace of at least 16 minutes per mile.
Are there any group discounts available for registration?
- →Groups of 5 or more participants can save $5 per person.
Where can I find more detailed course and race information?
- →Detailed course and location information can be found at Colorado13er ↗.
- →General event questions can be addressed via the 3 Races ↗ FAQ page.