Colorado Mountain Half+ Series

9786 S Holland St, Littleton, CO 80127, USA


Looking to join us in 2023? 

Register Here!


We all love a Colorado original and we certainly love the beauty and tranquility of our mountains. Five of Colorado’s original and most beloved half marathons and unique 25K are teaming together, along with HAL Sports to bring youColorado Half+ Mountain Marathon Series! So you can  Run Among the Peaks! in the most beautiful areas around Colorado. All events share that they are all non-profit organizations supporting area youth programs. Plus each event you do will earn points towards series awards.

It all starts on June 19th with the Estes Park Half Marathon, part of the Estes Park Marathon weekend with something for the entire family.  Run the original in one of the most beautiful town landscapes known for its resident elk herd and the ever-famous Stanley Hotel. All are situated at the base of Rocky Mountain National Park.

Next test your speed and work to a new PR with one of Colorado’s oldest half marathons, the 43rd Annual Georgetown to Idaho Springs Half Marathon (known as GTIS Half) takes place on August 13th. You start at beautiful Georgetown Lake between towering Rocky Mountains as you cruise through what is mostly downhill and fast course into iconic Idaho Springs. 

The series then heads to the "Switzerland of America" with the Mt. Sneffels Marathon weekend and its iconic half on August 20th taking you on a journey between some of the most spectacular mountain ranges and views in the US through the area's valley on a declining course. You might even see a camel and a yak along the course (true story).  

Next up is the 40th Annual NedNed Half Marathon in Nederland on September 10th. Nederland is known for its amazing beauty and the world-renowned Frozen Dead Guy (I know I have your attention now). It is nestled in a valley cut out by glaciers; you will run mostly on trails in beautiful national forests with Barker Reservoir as your backdrop.

Wrapping up our series is our "+" to this year's series with the Lead King Loop 25K (15.5 Miles) on September 18.  This is has been an iconic and favorite event for many runners and hikers.  You will experience some of the most amazing fall colors in some of the most beautiful areas of Colorado. Your efforts will be rewarded with serenity, BBQ, and beer for those 21 and over. 

Register for 3, 4, or all five iconic events that will take your breath away! 

Estes Park Half Marathon - Sunday, June 19th

Georgetown to Idaho Springs Half Marathon - Saturday, August 13th

Mt. Sneffels Half Marathon - Saturday, August 20th

NedNed Half Marathon - Saturday, September 10th

Lead King Loop 25K - Sunday, September 18th