Colorado Mountain Half+ Series

JUN
21
2026
Experience the peaks of Colorado through a series of four half marathons and a 25 km trail race. Run through iconic locations like Estes Park and Nederland while supporting local youth programs.
Sun 21 Jun 2026
25 kilometers 13 miles

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Colorado Mountain Half+ Series 2026

The Colorado Mountain Half+ Series consists of five distinct distance running events held across various mountainous locations in Colorado. Participants have the option to register for a bundle of three, four, or all five events. Each race in the series is organized by a nonprofit organization dedicated to supporting local youth programs.

The series includes four half marathons and one 25 km distance. The individual events are scheduled as follows:

  • Estes Park Half Marathon: This race takes place at the base of Rocky Mountain National Park. The course is set within a mountain landscape known for its resident elk herd.
  • Georgetown to Idaho Springs Half Marathon: This event follows a mostly downhill course. It begins at Georgetown Lake and concludes in Idaho Springs.
  • Mt. Sneffels Half Marathon: Located in an area referred to as the Switzerland of America, this race features a declining course through a valley with views of surrounding mountain ranges.
  • Ned-Ned Half Marathon: This trail-based event is held in Nederland. The route passes through national forests and utilizes Barker Reservoir as a backdrop.
  • Lead King Loop 25K: Representing the "+" in the series title, this 15.5 mile course takes place in September. The event includes a post-race barbecue.

Participants can earn points at each race toward series awards. Registration is available for teams or individuals, and gift registrations are also supported. The series covers a total of approximately 67.9 miles for those completing all five events. Visit the organization's website for the most recent information.

25 km
Lead King Loop 25k
13 mi
Ned Ned Half Marathon
13 mi
Mt. Sneffels Half Marathon
13 mi
Georgetown to Idaho Springs Half Marathon
13 mi
Estes Park Half Marathon
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