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Colorado Mountain Half+ Series

Keystone, United States • 15 Jun 2025

The Colorado Mountain Half+ Series 2025 is a scenic running series featuring five iconic events across multiple Colorado locations, totaling 67.9 miles. Participants can run half marathons and a unique 25K through stunning mountain landscapes including Estes Park, Georgetown to Idaho Springs, Mt. Sneffels, Nederland, and the Lead King Loop.

The courses offer a mix of downhill, trail, and valley routes with breathtaking views, wildlife sightings, and vibrant fall colors. Each event supports local youth programs as non-profits. Runners earn points toward series awards by completing multiple races, making it a rewarding challenge for mountain running enthusiasts seeking beauty and community. Visit the organization's website for the most recent information.

United States Colorado Keystone

Race information

Website Registration
25 km
25k Lead King Loop
21 km
Half Marathon
Visit the organization's website for the most recent information.
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