Louisville Trail Race

Louisville Trail Race is held in Louisville, Colorado, on November 14, 2026, as part of the Endurance Race Series. Three trail distances are available: a half marathon (13.1 miles), a 10K and a 5K. Located just outside Boulder, the event offers a mid-November trail day along the Front Range without the technical demands of the high mountains.

If you are new to trails, the 5K and 10K are welcoming, and the half marathon is a reasonable step up for road runners who want a change of scenery and some rolling terrain. Louisville sits above 5,000 feet, so if you are traveling from lower elevations, plan on arriving a day or two early and pacing by effort. A 10- to 12-week build with one weekly trail run and a long run reaching 12 miles for the half will put you in good shape. Cold mornings are common in November, so layer accordingly.